The world of Long Summer is shrouded in eeriness. Every six days, on the seventh day, this strange entity invades the dream realm, releasing its malevolent forces to affect reality. On this particular day, an unusual murder case in Kuroki City leads to the discovery of a mysterious girl. She possesses the Eye of Truth, which allows her to see through illusions on the seventh day.

Reborn as a happy little angel, Sasha awakens a strange sheep power. In the Trial World, I punch demons; in the Knight World, I judge the fallen church; in the Zerg World, I build shelters; in the Arcane World, I overthrow the corrupt empire; angels sing for me, demons bow before me; you think I am the light of dawn, the king of angels? Actually... I'm just a silly sheep!