Gods and Goddesses love countless mortals over the span of their lifetimes. But by Law, only One Immortal. So when the heart is conflicted, all involved will suffer. And suffer greatly. Every case is different, but they have all ended the same. There is only the span of a human life to make the choice of eternity. Too bad she's already wasted her time..

Ayazawa Yuki is emotionless student in the morning and assassin at night in order to look for the person who killed her parents. Assassination jobs were given by Tsukimori Touma, who is a teacher in her academy. Everything was normal to Yuki, until a person named Kyouya Hibiki annoys her. Will she start to feel different emotions because of him? Or will she turn her back at him and continue her duties as an assassin?