都内の高所得者集う某区に所在する有名私学に資金力だけは一流だが、実績も覇気もない水泳部がある。金持ちの子息たちが呑気に遊んでるだけの部活に学校運営が新しく招聘したのが、安達夕莉。中途半端な強化では意味がない…熱血な一面のある彼女が打ち出したのは、‘競泳コーチとして最も合理的な装い’を選ぶこと。常識を逸脱したとしか言いようがないおっぱい丸見えの競泳水着姿でプールサイドに降臨した彼女は低迷する水泳部を、思春期の男子たちを救うのか、喰うのか、それともー。

In a certain high-income district of Tokyo, there's a prestigious private school with a swimming club that boasts top-notch financial resources but lacks both achievements and ambition. The school management has brought in a new coach, Adachi Yuri, to this club where the sons of the rich are just messing around. Half-hearted efforts won't do any good… With her passionate side, she comes up with the idea of choosing the 'most rational attire for a competitive swimming coach.' Appearing poolside in a swimsuit that completely exposes her breasts—a look that can only be described as defying common sense—will she save the struggling swimming club and its adolescent boys, or will she devour them, or something else entirely?