モテない大学生あきらは、親の再婚に伴い新しい義理の妹なつができる。なつは口が悪いが、親の前では真面目で可愛い娘でいた。「お兄ちゃんてモテないでしょ」「お兄ちゃんの雑魚チンポじゃ女の人は絶対気持ちよくないだろうな」など徹底的に兄を煽る。そんな態度にブチ切れ、なつに襲いかかる。
Unpopular college student Akira gets a new sister-in-law, Natsu, when her parents remarry. Natsu has a foul mouth, but in front of her parents, she was a serious and cute girl. She thoroughly incites her brother, saying, “You’re not popular with your brother.” She is irritated by such an attitude and she attacks Natsu.

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