Mizuno Shin'ichi

An average lad who doesn't especially excel at anything. His childhood friend Yotsuba is like a little sister to him, but recently, he started seeing her more as a woman.

As Yotsuba becomes prettier by the day, Shinichi believes that an average guy like himself is not a good match for Yotsuba, but he's confident that he loves Yotsuba more than anyone else. Actually, Yotsuba feels the same, but since both are ignorant and late bloomers when it comes to love, they have yet to notice their feelings for each other.