Synopsis

Mizuto Irido and Yume Ayai were a couple back in middle school. They flirted, bickered over nothing, and gradually got more annoyed than interested in each other—so they broke up right before graduation. Neither expected to see the other again. Then their parents got remarried. Suddenly, the ex-lovers found themselves as step-siblings. Worse, they both claimed to be the older one. To keep things from getting awkward around their parents, they made a deal: whoever starts thinking of the other as anything more than a sibling loses. Simple enough, right? Except they share a bathroom. They ride the train together. They live in the same house. And neither can quite forget what they used to mean to each other. How long can two people who've already dated actually pretend to be just brother and sister?

Content compiled by AnimeList.moe from publicly available sources.

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