Kawaii-san Wants to Do It Until the End!

Oikawa is a completely normal student, except for being a little sulky. One day during gym class, while he is captivated by Kawai, a carefree girl he secretly has a crush on, a flying ball hits him in the head and he passes out. When he wakes up in the nurse's office, Kawai is there! Oikawa tries to stand up immediately, but loses his balance and dives into Kawai's chest! What's more, Kawai has noticed Oikawa's penis, which has been quietly growing, leading to an unexpected development...!? He has a cute face but is quite extreme! A slapstick, sexually charged romantic comedy begins! (Source: Rush!, translated)