Tenshi (a Death Angel) is thrusted into the human world to torment and kill a young woman named Emica. Within moments of his arrival on the surface, everything goes wrong. Injured and with no way of returning to his place of origin, he is forced to face the stain of his existence and failures, including his newfound feelings for Emica. Failure to kill Emica will result in his own death by the goddess Izanami. Before he can confess his feelings, the world is greatly shaken by the declaration of war. The goddess Izanami and the god Izanagi are hellbent on ending their eternal feud and at the cost of the human race. Tormented with this knowledge and his unrequited love, Tenshi is sent on a secret mission to stop the war. With the girl he secretly loves by his side and doom hidden around every corner: can Tenshi save the world, Emica, and his own soul before the apocalypse?