Flowers for My Still Beloved

In Hinomori City, a prestigious academy accepts girls from elementary through high school to educate and guide them toward their destined paths. As one of the steps towards that goal, girls entering the junior high division get paired with girls from the high school division, bonding together to learn and teach the ways of proper womanhood.

Manatsu, a girl who's been in the school since elementary and has only sparingly interacted with boys, is best friends with Kimi, a transfer student escaping the cruelty of them at another. Through lucky chance, they get assigned the same high schooler as their mentor.