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My Stepmom's Daughter is My Ex

12 Episodes
24 min each
SUMMER 2022

Synopsis

Ah, high school. Is there any better place to start fresh after a horrible middle school relationship? Nope! Not unless your ex ends up at the same school as you and is now your stepsibling. What was supposed to be a sanctuary of peace where I could avoid ever seeing her again has become a living nightmare! Everywhere I look, I see her—in my house, in my school, in my class. There's no escape! She even claims that she’s the older sibling. Like hell she is! But I won't lose to her. After all, I'm the older brother in this new family situation. That’s right, we’re family now. No matter how much we may have thought we loved each other before, we saw one another’s true colors and realized we weren’t meant for each other. That’s why even though we may keep up a buddy-buddy sibling act for the sake of our parents, things will never go back to the way they used to be.

Comedy Romance
Format
Unknown
Episodes
12
Per Episode
24 min
Source
Unknown

Episodes

12 / 12 Episodes
1
Episode 1

The Former Couple Refuses to Say... "It's things like this...!

Mizuto and Yume used to date, but now they've suddenly become stepsiblings. Both of them agree that they don't want to do anything that'd disappoint their newly remarried parents. However, neither of them can accept the other as being the eldest sibling in the relationship. So they both agree to settle the matter with a game. Whoever does something in conflict with what people might consider normal sibling behavior, loses. Making them the younger sibling.
2
Episode 2

My Ex Needs Taking Care Of "Thirty-Eight Degrees, Apparently

After entering high school, Yume was making an effort to change her personality and looks in an attempt to reinvent herself as a model student. It was all so far so good, but there was one thing she couldn't change about herself. She was never very athletic. On the day of the physical fitness test and body measurement check at school, a melancholy Yume is approached by Minami Akatsuki, a girl from the same class. Meanwhile, Mizuto is as disinterested as ever...
3
Episode 3

My Ex Has a Confession to Make 'You Didn't Do Anything Weird, Did You?

It's nighttime at the Irido residence. Yume has somehow found herself with Mizuto's boxers in her possession. If Mizuto were to find out, it would almost certainly mean she would have to face the punishment of admitting to being the younger sibling. Hoping to avoid this outcome, Yume waits for Mizuto to fall asleep before heading to the bathroom to return his underwear to the laundry basket. But who does she pass in the hallway, but a bewildered Mizuto, mouth agape, with Yume's very own bra dangling from his grasp.
4
Episode 4

That's Not What You're Supposed to Say

As punishment for the underwear incident, Mizuto demands Yume go on a date with him. Yume is taken aback by the sudden development, but little did she know that it was all part of Kawanami Kogure's devious plan, a plan to shatter Minami Akatsuki's delusional dreams of marrying Mizuto only to become Yume's doting little sister. And how else to do it but to show her that Yume only has eyes for Mizuto?
5
Episode 5

The Former Couple Spends the Night 'You're Welcome

It's Mother's Day, so Yume and Mizuto go out to buy a gift together. Their mother, Yuni, is overcome with happiness to receive a gift from the two of them. Seeing how happy it made her, Mizuto wonders if it'd be nice to give their parents some time to be newlyweds together. However, there isn't much they can do for them on a high schooler's budget. So Mizuto suggests that he and Yume spend the night somewhere instead.
6
Episode 6

The Former Couple Goes Head-to-Head 'Do You Think I'm Stupid?

The first midterms of the school year are upon them. Once the top scoring student in the school's entrance exam and now a talented student at the top of her year, Yume is anxious to defend her position as a model student. She is displeased, however, to discover Mizuto’s relaxed approach to studying. The two later butt heads again, over something Mizuto did during their Japanese exam. Yume berates Mizuto for his actions while Mizuto retaliates in kind.
7
Episode 7

Higashira Isana Doesn't Know What Love Is

Due to their mutual interest in light novels, Isana considered Mizuto a dear friend. However, Yume and Akatsuki make her realize that her feelings for him may run much deeper than that. Now aware of her true feelings, Isana wishes to become Mizuto's girlfriend. Unfortunately, he doesn't seem to be reacting to her advances. Yume and Akatsuki try to give her advice, but it doesn't quite go according to plan.
8
Episode 8

The Former Couple's On Edge 'I've Already Been Rejected, So It's Fine.

Isana is coming over to the Irido house this weekend to hang out with Mizuto. Suspecting that she may not know how to properly dress for the occasion, Yume and Akatsuki invite Isana out to go clothes shopping the day before. Unfortunately, however, every outfit she tries on ends up looking inappropriate due to the size of her breasts. Akatsuki suggests that she try on something with a softer silhouette similar to Yume's usual style, seeing this as an opportunity to pick out new clothes for Yume to try on too. Yume then reminisces about a date she had in middle school.
9
Episode 9

Youthful Indiscretion

We are brought back in time to when Yume and Mizuto were once a couple. A time when neither of them could control their nerves in what was their first ever relationship. Having already held hands and kissed before, the young couple are eager to take the next step. Spring break passes, however, with neither able to make the first move. Upon entering their third and final year of middle school, the two are regrettably put into separate classes. Alas, unable to spend as much time together as before, they both begin to grow apart.
10
Episode 10

The Former Couple Doesn't Know How to Act 'Aren't You Two Acting a Little Awkward?

It's Yume and Mizuto's first summer together as stepsiblings. Their parents are unable to return home one night due to a typhoon. Now alone in the house together, trouble arises when Yume spots a certain creepy crawly in her room. On another day, Mizuto accompanies Yume clothes shopping for a swimsuit in preparation for an upcoming family trip to the countryside. It's in situations like these that the two seem to be finding themselves reminiscing about the past more and more...
11
Episode 11

The Former Couple Visits Relatives 'I Guess You Could Say She Loved to Laugh

The Irido family go to the countryside to visit relatives. There, Mizuto shows Yume the first book he ever read on his own, his great-grandfather's autobiography. Reading it prompts Yume to ask him what kind of person his first love was. The description he gives, that she was someone who loved to laugh, leads her to believe his first love must have been none other than his second cousin, Madoka.
12
Episode 12

I Bestow Unto You My First Kiss

Still in the countryside visiting relatives, Yume and Mizuto head to the local summer festival together. In high spirits from getting to see him in his yukata and seeing how Madoka and Chikuma interact as siblings, Yume boldly takes his hand in hers as they walk around the festival stalls. During their outing, Yume begins to get a picture of how Mizuto was as a child. And in doing so, realizes just what his meeting her meant to him.

Characters

Yume Irido
Voice Actors
Rina Hidaka (japanese)

Yume Irido

Main

Mizuto Irido
Voice Actors
Hiro Shimono (japanese)

Mizuto Irido

Main

Isana Higashira
Voice Actors
Miyu Tomita (japanese)

Isana Higashira

Supporting

Kogure Kawanami
Voice Actors
Nobuhiko Okamoto (japanese)

Kogure Kawanami

Supporting

Akatsuki Minami
Voice Actors
Ikumi Hasegawa (japanese)

Akatsuki Minami

Supporting

Mineaki Irido
Voice Actors
Kazuyuki Okitsu (japanese)

Mineaki Irido

Supporting

Staff

Kyousuke Kamishiro
Kyousuke Kamishiro
Original Story
TakayaKi
TakayaKi
Original Character Design
Shinsuke Yanagi
Shinsuke Yanagi
Director
Hitomi Mieno
Hitomi Mieno
Series Composition
Katsuyuki Satou
Katsuyuki Satou
Character Design
Keiko Kitayama
Keiko Kitayama
Prop Design

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Start Your Journey

12 episodes • 288 minutes total

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Information

Aired Jul 05, 2022 to Sep 20, 2022
Season SUMMER 2022
Source Unknown
Format Unknown

Studios

project No.9