"Be *my* mom!"

The protagonist, Isaki Sanada, called out Mihori Imiya, known as the most beautiful girl in school, intending to ask her for a difficult favor. However, due to extreme nervousness, he made a terrible slip of the tongue, which left Mihori bewildered, and she ended up running away.

The difficult favor Isaki truly wanted to ask—was a heartfelt plea for Mihori to "act as a mother figure for his 5-year-old sister, Shuri."

Upon learning of the circumstances, Mihori saw "her past self" in Shuri, and, despite her hesitation, accepted the role of mother. As she got more involved with Isaki, she began to uncover the worries hidden in his heart—

"Don't sacrifice anything. We'll make memories together."

"Spending time with Isaki-kun and Shuri-chan, playing together... then those will surely become memories unique to us."

Through their impromptu pseudo-family (play-house) life involving a kindergartener and high schoolers, Isaki and Mihori gradually grow attracted to each other.

Depicting not only romantic love but also familial love, a heartwarming rom-com with a classmate-turned-mom now begins!

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