My Stepmom's Daughter is My Ex is a tV series anime that premiered in summer 2022, produced by project No.9.

About the production: the story comes from a light novel, there are 12 episodes of about 24 minutes and its current status is "finished".

Its main genres are comedy and romance, with themes such as Inseki, Heterosexual, Female Protagonist and Male Protagonist.

On AniList, My Stepmom's Daughter is My Ex has an average score of 66%, a good score, and appears on 110,348 users' lists.

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. (Source: J-Novel Club)

Official synopsis from AniList.