Fuefuki

Arikawa Ougi, 16 years old, suddenly found himself reincarnated as a zombie?! Embarking on a journey to subjugate the Demon Lord as a zombie hero, but the use of "power" requires a "price"...? A dark fantasy in another world.

Isaka & Mizuno go to the old school building which is about to be demolished… But they see 'something' there & get curious about the 77 Billion Disasters