Tensura: Hero of the Return

“A normal student named Kaito is a fan of manhwas, but there is a type of manhwa he likes more, and those are the manhwas where the protagonist is a returnee who goes back in time. Kaito read all the returnee manhwas, and that increased his desire to possess the ability to return always, no matter what. But what he didn’t know is that his wish came true, and he woke up in a fantasy world full of demon kings.”