Uhou Renka

雨芳恋歌

Ryouhei is suddenly summoned back to his hometown in the countryside. There, he meets Karen the mascot-girl of a lodging house. As he stands entranced by the sight of her bewitching proportions, Nagisa, the sister of Ryouhei's ex-girlfriend and the one who introduced him to Karen, looks on uneasily. (Source: AniDB)