Synopsis
Mikako is a 15-years-old and since the death of her parents, she lives alone with her elder sister Megumi. Megumi wants to do an omiai (a wedding with a man, she doesn't know--an arranged marriage) but Mikako has a sister-complex and wants to look at him by living in the same apartment ("through a mistake by the broker").

Mikako is shocked when she sees, that this BOY is probably only 17 or 18-years-old (or even 16..!). Too young for my sister! Mikako thinks, and senses that Ro is a playboy.