一个年轻人和他的老姐妹一起长大，他像一个姐姐一样。 当他长大的时候，他去她的朋友也在她家中探望她。 他们三人在屋顶下制造了一些有趣的情况。

这部完整无删减的《小姐姐》讲的是A young man grows up with his older cousin who is like an older sister to him. When he grows up, he goes to visit her at her home where her friend is also visiting. The three of them under roof make for some interesting circumstances.