Summary: Japan and Britannia have been enemies for a long time, Holy Britanian Empire declared war on Japan however Japan lost and renamed it "Area 11" ; Lelouch , Former 11th prince of the royal family seeks revenge for the death of his mother and the cause for his sister's lost of sight to seek the truth he has to be against Britania by the help of C2 and Geass.

Mizuto Sato, A Middle school student who was transferred in another world as a bat?! Why a bat of all things?! He can only leave the cave every night and will do anything to survive even if it's a human, a demon or a monster.