かわいくて巨乳なクラスメイト「那美」にムラムラする「りく」と「はると」。練習中、那美を見て「おっぱいを見せてほしい」とつい本音を言ってしまう。困惑しながらも断りきれずおっぱいを見せてくれる那美に驚くりくとはると。「もしかして断れない女子なのでは？」と考え、那美にセックスをお願いする。なんとその願いも断れず受け入れる那美にそのまま中出しセックス！その後セフレになってというお願いも了承する那美。那美の幼馴染の男を差し置いてりくとはるとは大喜びで何度も那美とセックスしていく！

Riku and Haruto are aroused by their cute, big-breasted classmate, Nami. During practice, they look at Nami and blurt out their true feelings, saying, "We want to see your boobs." Surprised, Nami, though confused, can't refuse and shows them her boobs. Thinking, "Maybe she's the kind of girl who can't say no?", they ask Nami for sex. Surprisingly, Nami can't refuse their request either and accepts, and they have unprotected sex with her! Afterwards, Nami also agrees to become their sex friends. Ignoring Nami's hood friend, Riku and Haruto are overjoyed and have sex with Nami many times!