メス堕ち！巨乳水着妻達とのラブエロスイミング！～プールで監視員のバイトを始めたら水着の人妻達に囲まれて童貞喪失した!?～

The protagonist is an ordinary college student. During the summer vacation, he is asked by his childhood friend's older sister, Misato, to work part-time at a swimming school. He gets to know the office lady Riku who is a customer, and the housewife Nanami who attends the school. The protagonist becomes close with them. Although he knows it's wrong because they are married women, he can't resist the attractive breasts wrapped in swimsuits and his own lust, and they become emotionally and physically intimate.