一對合住一間房的兄弟的青梅竹馬小舞突然出現。哥哥和弟弟一直都喜歡小舞，於是三人突然開始同居。如今長大成人，他們的關係早已不再像孩童時期那樣親密。哥哥越界，弟弟目睹這一切，也開始和小舞發展出一段戀情。為了解決這段長久以來的三角戀，小舞提議和兄弟倆一起玩三人遊戲。起初，場面有些尷尬，但隨著遊戲的進行，三人之間的互動逐漸變得有趣起來，彼此的關係也日益加深…
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