Completed Anime

“Ex-couple become step-siblings, compete for "older sibling" title while rekindling past feelings under one roof.”

My Stepmom's Daughter Is My Ex

継母の連れ子が元カノだった

6.72

6,268 rank · 336,551 viewers · 1,593 favorites

Comedy Romance

12 episodes · 23 min per ep min · Summer 2022 · Project No.9 · PG-13 - Teens 13 or older

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Episodes · 12 12/12 aired

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Synopsis

Ex-couple become step-siblings, compete for "older sibling" title while rekindling past feelings under one roof.

Listless geek Mizuto Irido and introverted nerd Yume Ayai seemed like a match made in heaven, connected by their mutual love for literature. Unfortunately, their differences gradually grew, and they separated just after their middle school graduation. But, as if by divine comedy, the two find themselves reunited as step-siblings. A rivalry begins to brew between the former couple, both unwilling to acknowledge the other as the older sibling. In an attempt to "solve" this issue, Mizuto and Yume agree upon a rule: whoever crosses the boundaries of siblinghood norms loses, and the winner will not only be called the older sibling, but also get to make a request. However, now that they live under the same roof, the lingering memories they share start to influence their actions—possibly rekindling the feelings that may not have been fully extinguished in the first place.

[Written by MAL Rewrite]