List of Onimai: I'm Now Your Sister! Chapters (2024)

No.TitlePublication Date1Mahiro's Confusing New BodyFebruary 25, 2017Mahiro Oyama, a male otaku and a slacker, wakes up one morning to discover that one of his younger sister's experiments has transformed him into a middle-school aged girl.1.25/SpecialBlu-ray Volume 1 Appendix MangaApril 19, 2023In this exclusive chapter which takes place in the anime's continuity, Mahiro tries to adjust to life as a girl following the start of Mihari's experiment on her.1.5Mahiro and the BathroomMay 6, 2017Mahiro, while playing video games, has to pee and face the bathroom for the first time as a girl.2Mahiro Faces the MirrorMarch 24, 2017Mahiro showers and sees her girl self for the first time in the mirror, and Mihari decides to have some fun and dress Mahiro in girl's clothing.3Mahiro's Self ImageApril 22, 2017After Mahiro gets turned on by a BL game, Mihari convinces her to go outside and exercise to feel better.4Mahiro Plays an MMOMay 27, 2017Mahiro starts playing as a female healer in an MMO game.5Mahiro's Melancholy DayJune 24, 2017Mahiro starts feeling bad5.5Mahiro, Even On Heavy DaysAugust 13, 2017Mahiro suffers through her first period, with Mihari introducing her to pads and tampons.6Mahiro and the Secret GardenJuly 29, 2017Mahiro and Mahari head to a public bath after their water heater breaks.6.5Mihari's Wasted EffortsAugust 13, 2017Mahiro mentions that Mihari isn't living up to her own ideals about changing clothes everyday and challenges her to dress up for a change.7Mahiro's Unexpected EncounterAugust 25, 2017Mihari's friend from middle school Kaede Hozuki comes over for a visit and starts to bond with Mahiro.8Mahiro Starts OverSeptember 30, 2017A box falls on Mahiro's head, causing her to lose her memory and revert her personality to that of a young girl.8.5Mahiro and the Gatcha GameFebruary 11, 2018Mahiro wants money to buy a random entry into a gatcha game, but Mihari will only give him the money if he leaves the house to buy it himself.9Mahiro and the Girls' Day OutOctober 28, 2017When Mahiro and Mihari go to the mall to see a movie, they run into Kaede and go shopping.9.5Mahiro and Kaede's SecretDecember 31, 2017While seeing the movie with Mihari and Kaede, Mahiro has to pee and encounters the perils of a public woman's restroom.10Mahiro the Own-Home Security GuardNovember 27, 2017Mihari comes down with a sudden cold, so Mahiro takes it upon herself to take care of her.10.5Mahiro Helps OutJune 27, 2018 (Japan)

August 31, 2021 (North America)

To thank Mahiro for helping her out the other day, Mihari gives her a chore card with a promise of an increased allowance if the entire card is filled out.BonusMihari and Her Onii-ChanJune 27, 2018 (Japan)

August 31, 2021 (North America)

Mihari recalls discussing with Kaede in middle school about wanting a younger sister, and in the present day reflects on how much things have changed since she began her experiment with Mahiro.SpecialMahiro and the Uneventful HolidayDecember 31, 2018We get a glimpse into Mahiro's daily routine.11Mahiro Falls in LoveDecember 27, 2017Mahiro is sent out to buy groceries after losing a game, and ends up running into someone unexpected.12Mahiro's Night AloneJanuary 27, 2018Mihari works in the lab all night, so Mahiro is left home by herself.12.5Mahiro's Sunday MorningFebruary 11, 2018Mahiro enjoys a Sunday morning magical girl anime.13Mahiro's Wholesome PlaydateFebruary 24, 2018Kaede comes over to study, and brings Momiji with her.14Mahiro's Little AdventureMarch 31, 2018Mahiro leaves the house voluntarily to pick up some limited edition anime folders.15Mahiro Attends a PartyApril 28, 2018Mahiro and Mihari attend a Halloween party at Kaede and Momiji's house.15.5Siblings Share the KotatsuApril 28, 2018Mahiro and Mihari relax under a kotatsu.SpecialReal Record! Drama CD ReportApril 30, 2018Nekotofu showcases a behind the scenes story of what happened during the recording of the series first drama CD.16Mahiro Visits the SalonMay 26, 2018When Mahiro discovers she has split ends, Mihari takes her to a hair salon.17Mahiro's Panic! At the Hot Spring (Part 1)June 30, 2018Mahiro, Mihari, Kaede, and Momiji head on an overnight trip to a hot spring.18Mahiro's Panic! At the Hot Spring (Part 2)July 28, 2018The drug that turned Mahiro into a girl is starting to wear off, causing Mahiro's "comrade" to regrow. Now she must hide it from Kaede and a suspicious Momiji until a new dosage of the drug turns her female again.18.5 (Part 1)Mahiro and the Comrade's ReturnAugust 12, 2018Shortly after dinner, Mahiro decides to take advantage of her "comrade" while it is still here.18.5 (Part 2)Mahiro's PermAugust 12, 2018The morning after the embarrassing incident, Kaede uses her curling iron to give everyone waves in their hair.18.75/SpecialBlu-ray Volume 2 Appendix MangaJune 21, 2023In this exclusive chapter which takes place in the anime's continuity, Mahiro and her friends have a party at Kaede's house after the recent hot spring trip to determine plans for the future.SpecialMahiro and the After-Travel PartyAugust 11, 2019After the hot spring trip, Mahiro, Mihari, Kaede, and Momiji go to a karaoke bar.19Mahiro the StreamerAugust 29, 2018Mahiro tries to become a Vtuber.20Mahiro and the Middle SchoolersSeptember 29, 2018Tired of Mahiro laying around the house all day, Mihari arranges a get together with Momiji and some of her friends.BonusMihari's WardrobeJanuary 26, 2019 (Japan)

October 5, 2021 (North America)

Mihari recalls a time she went shopping with Kaede in middle school.BonusMihari's Wardrobe AfterwardsJanuary 26, 2019 (Japan)

October 5, 2021 (North America)

Mihari and Kaede reflect on how much things have changed for Mihari in terms of fashion.21Mahiro's First DayOctober 28, 2018.Mihari enrolls Mahiro in a nearby middle school, where she is placed in the same class as Momiji, Asahi, and Miyo.BonusMiyo's RefusalNovember 25, 2018During the events of the previous chapter, Asahi tries to give Miyo a hug.BonusMomiji's NicknameNovember 25, 2018During Mahiro's first day of school, Mahiro asks Asahi what her nickname for Momiji is.BonusKaede's ConcernNovember 25, 2018After Mahiro cringes from her first day of school, Mihari calls Kaede for advice.22Mahiro's Difficult ClassNovember 24, 2018Mahiro endures her first gym class as a girl.23Mahiro's Exciting WeekendDecember 29, 2018Mihari invites Kaede and Momiji over for lunch.BonusLater in the LabDecember 31, 2018Mihari has a chat with her faculty advisor Chitose Azuma about Mahiro.24Mahiro and ConversationJanuary 26, 2019Mahiro is excited about a new video game she just got, but is disappointed when her friends don't share her enthusiasm.BonusMahiro's LunchFebruary 17, 2019Mahiro and her friends eat lunch.BonusMihari's LunchFebruary 17, 2019Mihari prepares lunch for herself and Mahiro.25Mahiro's Final ExamsFebruary 23, 2019Mahiro and her classmates take their final exams.25.5Mahiro's TouchApril 29, 2019Momiji feels left out when Mahiro pets Asahi's hair.BonusAsahi's InnocenceNovember 25, 2018Mahiro comments on what Momiji said about her when she first introduced her to Asahi and Miyo.26Mahiro the PatissierMarch 30, 2019Mahiro and her friends learn how to bake cookies in Home Ec.26.5Mahiro's Twisted LogicApril 29, 2019Mihari notes that learning how to bake cookies has made Mahiro even more girly.27Mahiro's Sleepover (Part 1)April 27, 2019Concerned that Mahiro might backslide during winter break, Mihari arranges a sleepover at their house with Momiji, Asahi, and Miyo.27.5Mahiro's Sibling BathtimeApril 29, 2019Mahiro takes a bath with Mihari.28Mahiro's Sleepover (Part 2)May 27, 2019Mahiro's sleepover continues.29Mahiro's Double DateJune 29, 2019Concerned about Mihari after she says that she has a date, Mahiro and Momiji follow her to the mall.30Mahiro Rings in the New YearJuly 27, 2019It's the start of a new year, so Mahiro and Mihari visit a shrine.30.5Mahiro and the Spicy KissAugust 6, 2019To celebrate the new year, Mihari drinks some of Kaede's amazake.BonusAsahi and MomijiSeptember 27, 2019 (Japan)

November 30, 2021 (North America)

Asahi recalls how she became friends with Momiji in grade school.31Mahiro and the Allure of Bare LegsAugust 31, 2019Mahiro and her friends discuss the appeals and drawbacks of bare legs.32Mahiro and the Unexpected GuestsSeptember 28, 2019Mahiro comes down with a sudden cold, and with it comes the unexpected return of her "comrade".32.5Mahiro and the Mystery BrewDecember 30, 2019Back at school, Miyo suggests that Mahiro try her special energy drink to feel better.33Mahiro on Valentine's DayOctober 29, 2019It's Valentine's Day, and there is plenty of chocolate to give and receive.33.5Mahiro and the Homemade ChocolateDecember 30, 2019Mahiro and her friends compare their chocolate hauls from Valentine's Day.34Mahiro and the Adults Only SectionNovember 30, 2019Mahiro goes to a bookstore and finds some unexpected people in the adult's section.34.5 (Part 1)Asahi's CrepeFebruary 9, 2020Seeing that Asahi is hungry, Mahiro and Momiji decide to share their crepes with her.34.5 (Part 2)Mahiro's Yuri MangaFebruary 9, 2020Mahiro checks out the Yuri manga that Miyo recommended.34.5 (Part 3)Mahiro's "Something"February 9, 2020Yuta and Minato talk to Mahiro about her seeing them in the adult's only section at the bookstore the other day.35Mahiro and the Guidance of the StarsDecember 28, 2019Mahiro and her friends get in on the new horoscope craze.SpecialMahiro is Me and Mihari is MeDecember 30, 2019A bizarre accident causes Mahiro and Mihari to switch bodies.36Mahiro's Surprise PartyJanuary 25, 2020Mahiro's friends decide to throw her a surprise party for her birthday.36.5Mahiro's Final PresentFebruary 9, 2020Mahiro recieves a final birthday present from Kaede.37Mahiro Pretties UpFebruary 24, 2020Mahiro tries out the lip gloss that Kaede got her for her birthday.37.5Mihari and the High School GirlsMay 2, 2020Mahiro invites Kaede over to help Mihari dress more fashionably.38Mahiro's Relaxing Day OffMarch 28, 2020Mahiro's attempt to relax at home on her day off is thwarted when Kaede comes over to study with Mihari.38.5Momiji's MassageMay 2, 2020Kaede gives one of her massages to Momiji.39Mahiro's Big Secret (Part 1)April 25, 2020Mahiro and her friends begin a new school year, and meet someone new in the process.40Mahiro's Big Secret (Part 2)May 24, 2020Nayuta reveals that she knows the truth about Mahiro.40.5Mahiro's Bare FeetAugust 15, 2020Miyo notices that Mahiro isn't wearing her tights.BonusMihari's Skipped GradesJuly 27, 2020 (Japan)

January 25, 2022 (North America)

Mihari remembers when she started high school with Kaede.41Mahiro and the School PhysicalJune 24, 2020Mahiro and her classmates have their annual school physical.41.3Mahiro and the Health CommitteeAugust 15, 2020Nayuta collects the record sheets from the school physical.41.7Mahiro and the SpankiesAugust 15, 2020Mihari has Mahiro try on a pair of spankies.42Mahiro and the Gifted ExperienceJuly 25, 2020Mahiro decides to celebrate Mihari's birthday by taking her to an amusement park that they once went to as children.42.5Mihari and the Stuffed AnimalAugust 15, 2020Mihari recalls her first experience at the amusement park as a child.SpecialMahiro in a Close CallAugust 15, 2020Mihari makes a special medicine for Mahiro to help her feel warmer, but they run into trouble when Mahiro has Momiji drink it.Special2020 Summer Special BrochureAugust 15, 2020An in depth look at the main characters of the series.43Mahiro and the PerfumeAugust 29, 2020Mahiro tries out Mihari's new perfume.43.5Mahiro and the Full-Cup BraDecember 30, 2020Mahiro's bust has finally grown large enough to upgrade to full-cup bras.44Mahiro and the Barbecue SecretSeptember 26, 2020During Golden Week, Mahiro and her friends hold a beach barbecue party.45Mahiro and the Seasonal AttireOctober 24, 2020With Spring in full bloom, Mahiro and her friends begin to switch to their summer uniforms.46Mahiro and the Sticker CollectionNovember 28, 2020Mahiro and her friends get into the new sticker collecting fad.46.5Mihari's Sticker MemoriesFebruary 21, 2021Mihari recalls her own time collecting stickers when she was young.47Mahiro and the Sunshine GirlDecember 26, 2020While picking up Mihari's dry cleaning, Mahiro runs into Asahi who proceeds to take Mahiro on an adventure.SpecialMahiro and a Sleepy DayDecember 30, 2020Mahiro accidently pulls an all-nighter playing Lost Quest IX on a school night.47.5Kaede's NicknameFebruary 21, 2021Walking back from the burger place, Mahiro asks Asahi to think of a nickname for Kaede.48Mahiro and Visitation DayJanuary 30, 2021Mahiro and her classmates endure Parent Visitation Day.48.5Mahiro and the Parent-Teacher ConferenceFebruary 21, 2021Mihari meets up with Mahiro's homeroom teacher after Parent Visitation Day.49Mahiro and Swim Class (Part 1)February 23, 2021Mahiro and her classmates begin swim class.50Mahiro and Swim Class (Part 2)March 27, 2021Mahiro's "comrade" suddenly regrows while in the pool with the other girls.50.5Mahiro and the Comrade's Return AgainMay 2, 2021Mahiro decides to take advantage of the fact that her "comrade" has temporarily returned.BonusNayuta's Recent PastMay 27, 2021 (Japan)

March 22, 2022 (North America)

Nayuta recalls how she was enrolled in Mahiro's class.SpecialMahiro's Colorful LifeApril 27, 2022Mahiro reflects on how colorful her life seems now since she was transformed into a girl.51Mahiro and the Rainy SeasonApril 24, 2021Mahiro has low energy due to the rain outside making her hair frizzy, so she and Mihari go to visit Kaede and Momiji.51.5Mahiro and Self-StylingMay 2, 2021Mahiro once again has low energy, and tries to style her hair the way that Kaede previously did.52Mahiro and the Little GardenMay 27, 2021Mahiro and Mihari start a flower bed and a garden.53Mahiro, the Sun, and the Northern WindJune 26, 2021Mahiro and her classmates deal with the perils of an extremely hot day combined with an overpowered air conditioner.53.5Girls and BoysAugust 14, 2021Mahiro tries to figure out why Satsuki and Minori pick on the boys of their class.54Mahiro and the After-School FrightJuly 24, 2021Mahiro and Momiji get trapped in the school after-hours by a thunderstorm.54.5Mahiro's Cool HeadAugust 14, 2021Mahiro and Momiji have both wet themselves after being scared by Nayuta and try to find something else to change into.55Mahiro and the Midsummer RomanceAugust 27, 2021Mahiro is asked by Satsuki to deliver a love letter to Yuta.56Mahiro and the Strategy MeetingSeptember 25, 2021Mahiro and her friends get together to decide on something fun to do during summer vacation.56.5 (Part 1)Nayuta's SwimsuitDecember 31, 2021Chitose recommends a swimsuit for Nayuta.56.5 (Part 2)Kaede and the Junior High GirlsDecember 31, 2021Mai and Miyako run into Mahiro and Momiji and meet Kaede for the first time.57Mahiro's Beach Fun (Part 1)October 30, 2021Mahiro and her friends head to the beach.58Mahiro's Beach Fun (Part 2)November 27, 2021Nayuta accidently consumes the fast-acting feminization drug that Mihari brought along, causing her bust to grow tremendously.58.5Mahiro and the Squishy ThingieFebruary 20, 2022Asahi finds a sea cucumber.59Mahiro's Deep CleanDecember 25, 2021Mihari tells Mahiro to clean up her room.SpecialMahiro's Weekday RoutineDecember 31, 2021This special four-panel chapter gives a glimpse into Mahiro's daily routine on the days when she goes to school.60Mahiro's Summer HomeworkJanuary 22, 2022Mahiro and Momiji head to the library to gather material for a book report.SpecialDoujinshi Volume 20 Commemorative MangaFebruary 22, 2022Mahiro and Mihari celebrate the release of the twentieth volume of the doujinshi and consider what the future holds.BonusMahiro and the Photo AlbumsApril 22, 2022 (Japan)

October 25, 2022 (North America)

Mahiro and Mihari look through their old photo albums.SpecialMahiro's Anime TimeJanuary 7, 2023 (Japan)

July 25, 2023 (North America)

In this special full-color chapter, Mahiro tries to decide what genre of anime she should watch next.61Mahiro and the Summer FestivalFebruary 26, 2022To celebrate the end of summer, Mahiro and her friends go to a summer festival to see the fireworks.SpecialMahiro and After the FestivalAugust 13, 2023At the conclusion of the summer festival, Mahiro and her friends discuss the benefits and drawbacks of wearing yukatas.62Mahiro's Second Semester DebutMarch 26, 2022Mahiro and her friends begin their second semester of their second year at middle school.62.5Nemu's Summer VacationMay 5, 2022What Nemu did during her summer break is revealed.63Mahiro Shelters From the StormApril 30, 2022Mahiro and Momiji get caught in a rainstorm.63.5Momiji's Panty ProblemMay 5, 2022Still soaking wet from the rain, Momiji asks Mihari if she can borrow some of her underwear.64Mahiro's Weight-Loss PlanMay 28, 2022Concerned about her sudden weight gain, Mahiro decides to start exercising.65Mahiro and the Charming School Festival (Part 1)June 25, 2022The students of Class 1-B discuss what they should do for the upcoming cultural festival.66Mahiro and the Charming School Festival (Part 2)July 30, 2022Mahiro and her friends enjoy the school's cultural festival.66.5The Boys' Shift ChangeAugust 13, 2022After sucessfully serving in the maid cafe for Class 1-B, Yuta and Minato prepare to change back into their normal clothes.67Mahiro's Masculine EgoAugust 27, 2022When Mahiro and Mihari bum around the Neon mall, Mahiro decides to find a way to reclaim her pride as a big brother.SpecialMahiro and the Visible UndergarmetsAugust 31, 2022Mahiro and Mihari discuss unique types of female undergarments.68Mahiro and the Fan WorldSeptember 24, 2022Mahiro and Miyo go to Lily Garden 39, a yuri doujinshi festival.69Mahiro's Field DayOctober 29, 2022Mahiro and her friends participate in field day.69.5Mahiro's Cheer WearDecember 31, 2022Mihari asks Mahiro how field day went.70Mahiro's Autumn OutingNovember 26, 2022With the leaves changing color, Mahiro and Mihari decide to go hunting for momiji leaves.BonusMahiro's Cosplay Round-TableJanuary 7, 2023 (Japan)

July 25, 2023 (North America)

Mahiro and her friends have a discussion about cosplay.SpecialMiyo and the Enchanted NightJanuary 31, 2023Miyo fantasizes about yuri in her dreams.SpecialAsahi and Nii-chanJanuary 31, 2023Asahi asks her older brother to lend her some manga to read.SpecialPerfect Onee-chanJanuary 31, 2023Kaede does her best to stay in bed.SpecialMihari's Research LabJanuary 31, 2023Mihari has fun with her labmates at the University.71Mahiro and the Selfie CrazeDecember 26, 2022Mahiro gets into the habit of taking selfies.SpecialMahiro and the HaremDecember 31, 2022Mahiro realizes that her new life can be considerd a harem.71.5Mahiro and the Amateur ModelFebruary 19, 2023Mahiro and her friends learn that Kaede appeared as a model in a fashion magazine.72Mahiro and AdmirationJanuary 27, 2023Mahiro and her friends attempt to help Nayuta look more mature.73Mahiro and the Brother's SecretsFebruary 25, 2023Mahiro and her friends study over at Asahi's house where they meet her older brother Yuya for the first time.74Mahiro and Their Night TogetherMarch 25, 2023Mahiro and Mihari endure a sudden blackout during a thunderstorm.74.5Everyone and the Power OutageMay 5, 2023Mahiro and her freinds share stories about what they did during the recent blackout.75Mahiro and the Devilish GirlApril 29, 2023Mahiro runs into Yuta and Minato on her way to purchase a new game.76Mahiro and the CrisisMay 27, 2023Mahiro's "comrade" grows back in the middle of class.SpecialA Story Where That GrowsMay 27, 2023Mihari accidently consumes one of Chitose's experimental drugs, which Chitose says will cause Mihari to grow a certain something.77Mahiro and the Going-Away PartyJune 24, 2023Asahi learns that Nayuta is moving away soon, so she and the others decide to throw her a going-away party.78Mahiro Plays an MMO, AgainJuly 29, 2023Mahiro starts playing a new online game called Imagical Online and ends up befriending someone unexpected.78.5The Boys Play an MMOAugust 13, 2023Yuta and Minato start playing Imagical Online in an attempt to get closer to Mahiro after she mentions that she just started playing it.SpecialMihari and the Drinking PartyAugust 13, 2023Mihari and her colleagues have a drinking party.SpecialA Story Where That Grows Part 2August 13, 2023Tsubasa accidently causes Mihari to ingest one of her experimental drugs.79Mahiro and the Gal SquadAugust 26, 2023Mahiro runs into Kaede, as well as two unexpected girls, while out and about.80Mahiro and the Secret RendezvousSeptember 30, 2023Mahiro and Miyo begin to play through a yuri-themed visual novel in secret after school.BonusMahiro and the Ko-Gal SquadNovember 27, 2023 (Japan)

June 18, 2024 (North America)

After Mahiro and Momiji show off the photo from their recent outing, Kaede offers to give gyaru makeovers to the rest of their friends.
List of Onimai: I'm Now Your Sister! Chapters (2024)

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