Fallen Angel

Tenshi (a Death Angel) is thrust 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 stains 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.

Six months have passed since the battle between Heaven and Hell. Everyone has found their place in the postwar world, all except for Tenshi. Struggling to fill his days, Tenshi finds himself longing for action, that is, until a frost threat comes knocking at their door. A mysterious letter arrives from Emicas parents. Tenshi, Emica, and Taro set off to Saiko Lake for a joyous family reunion. But clues left on dead friends' computers, warns of other alternative motives.