Koichi Komaki, a high school student who loves cooking, is cruelly dumped by his childhood friend for being "too feminine."

When a heartbroken Koichi returns to his apartment, he finds Shiho Hashiro, a popular idol high school girl, sitting anxiously on his sofa. He ends up cooking for Shiho, who has become his stepsister due to their parents' remarriage.

But as a result, Shiho quits being an idol and declares she wants to marry Koichi...!?

This is a romantic comedy about an idol stepsister and her stepbrother cohabiting, cooking together, going on secret dates around town, and even sharing baths and beds (?!), as they gradually become a married couple!

Ranked #1 Daily & Weekly in the "Real-World Romance" category in August 2023!!!!!!!