この世界には好きになってはいけない人がいる――。亡くなった姉の夫・慶一郎と暮らす雪。
密かに想いを寄せるけれど、この禁忌の気持ちは決して言えない…。
傍にいるのが辛くて離れることを決めた矢先、酔った慶一郎に「お前の隣にいたいんだ」と告げられて!?

"The person I love is my sister's husband."

In this world, there are some people who you are not allowed to fall in love with—— Yuki lives together with his deceased older sister’s husband—Keiichirou. He fell in love at first sight, and continued to hold those feelings secretly since then. But that means nothing, for this love is not to be allowed. One night, Keiichirou hugged Yuki and said "Stay with me"! Since his sister’s death, the dangerous balance between them finally starts to crumble!?