Villainess summoner [Transferred]

Ps : Demiurge_Ohara, I'm_just_an_Isekai_writer and many more are one of the few accounts I have whenever I'm interested of publishing isekai fanfictions, so it means I'm not a newbie and I'm confident enough to write a decent fic. During his walk towards the train station, he suddenly felt nauseous and his surroundings changed abruptly as he was sent into a Pocket Dimension that seems to be his base of operations. With nothing but a summoning book and fragile protection against unruly summoned entities, he's sent with a 'mission' to entertain unknown entities by surviving which worlds he'd be sent to. Knowing his inevitable death, he did his best to survive-- No. to thrive on whatever world using whatever advantage he could use. screw canons, he wasn't meant to exist in this plane of existence in the first place. Disclaimer : I don't own the Cover or The Animes/series I use for my fanfiction, credits goes to their perspective creators and etc. PS : I'd rather like to avoid making a bad fanfiction so I'd rather appreciate the constructive criticisms, reviews, opinions and etc to help me improve my ability to write.