Fuyuka is a female college student attending an art college in Tokyo, despite her parents' opposition. She feels guilty about leaving her younger brother, who has been supporting her in their strict family home, and running away from home by herself. One day, she is at her wit's end because she can't pay the rent, when her grown-up younger brother, Ameon, appears in front of her...! She is now living together with her brother, whose love is too heavy for her to bear! 「僕のすべてを 好きにしていいんだよ」 親の反対を押し切り、東京の美大に通う女子大生の冬花。 厳格な実家に弟を1人残し、家を飛び出したことに対して罪悪感を感じていた。 そんなある日、家賃が払えず、途方にくれる彼女の前に現れたのは、大きくなった弟の雨音でーー！？ 弟だから同じ布団で寝るの…？これは姉弟愛！？それともーー 愛が重たい弟から愛されまくり…！ドキドキが止まらない禁断の同居ラブ！