Summer: Inaka no Seikatsu

Summer, sun, sunshine! The summer holidays have finally arrived, and the Protagonist is enjoying them … not at all?! Instead of going out into the fresh air, he prefers to spend his free time lofting in his flat. But all that changes with a single phone call! An old acquaintance asks him if he could look after her daughter, Hazuki, because she would like to go on a trip with her husband. Because anything is better than sitting around at home alone, he immediately sets off. But Hazuki has changed a lot in the last few years. She has become bigger … and so have her breasts!

(Source: aniSearch)