Vincent, the protagonist, is a man living in the city. He and his girlfriend Katherine have been dating for five years, but he is accustomed to the carefree bachelor life and has no interest in marriage. One day, at the bar Vincent frequents, he meets a beautiful woman and has an unexpected affair. While Vincent takes every precaution as not to let the fact that he cheated leak out, he also starts to receive the affection of Rin, a pianist who lost her memory. In the meantime, strange rumors have begun circulating the city—“Cheating men will fall into a nightmare. If someone dies in their dreams, it will bring about death even in the real world.” Will Vincent be able to escape his nightmare? And who will Vincent choose after repeatedly fighting through hell…!?