Everyday is a normal day in the small town where Kasuga Arata lives.
However, everything changed on the day of the Black Sun, and following
it, a magician appears before him. The Black Sun caused the Breakdown
Phenomenon which destroyed the town where he lives. Because of this, his
normal life was artificially reconstructed by a Grimoire that his
childhood friend had left. Just what is the purpose of the magician
coming to the town? What will he do with the Grimoire's keepsake?
