Synopsis

During summer break, Gash and his friends head to Mount Fuji for a picnic. There they meet Kotoha, a girl with a magical book that contains a message about Gash's mother being trapped in a nearby cave. When they find the cave and venture inside, they discover a portal to another world—and a blond-haired boy named Wiseman who needs help. Things get complicated fast. The Black Knight, the world's strongest warrior, shows up and accuses Gash of stealing the 101st magical book. Now Gash and Kiyomaro have exactly 24 hours to track down the real thief, or they'll be stuck in this alternate world forever.

Content compiled by AnimeList.moe from publicly available sources.

Genres