Another World: Starting with a Book of Zeref

Al travels through another world and inexplicably breaks into the demon world. These other time-travelers at least have a territory, and I'm facing a demon who wants to twist my head off at the beginning? Facing several demons who have very specific ideas about his head, fortunately, he has a system that can summon helpers from anime. With the help of the system, Al's power continues to expand. Al: "No one can fight?" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.