Nee Summer!

The joys of summer break the sunshine, sun soaked beaches, time off work at school, and in the case of Yuuta Yamauchi, a torrid love affair using your cousin. Nee Summer! details the sexual relationship between Yuuta and the cousin, Kei Higashide, who provided to help him study for his college entrance exam.

As his or her relationship develops, Kei becomes conscious of a lady named Youko who might be toying with Yuuta. Yuuta's summer is getting ready to end up very complicated, and it's anybody's guess if he'll actually have any studying done!