Kasshoku Mermaid

By chance, Yoshino became a swimming school's coach. There, it's a paradise full of tanned swimsuit girls, both students and coworkers! A tsundere cousin, an innocent girl, a small devilish girl who looks innocent, and a good female coach who is hard on the wily glasses girl... I'm already crazy about the days when the diverse heroines' smooth brown bodies get wet and wet ♪ (Source: GOT, translated)