Gekkou Jourei

A high-school student named Gekko Iwasaki is chosen to carry out the "Moonlight Ordinance," a rule aimed at restoring the world to its original state. This world is periodically influenced by blue moonlight, which occurs once every few decades. The story involves characters drawn from fairy tales, mythology, and other stories who become active during these events. Iwasaki must confront these figures as part of his duty.