Put the LL Storyline Back on Track

The protagonist of our "series," Chen, yes, that's really his name, is an ordinary top student in high school, but he's actually a veteran otaku. Uh, enthusiast. Right. While saving someone from danger, he dies, and the god of the 2D world... saves his soul and tells him that the storylines of various 2D worlds have collapsed. We have to transmigrate back and forth between different worlds to save their stories and protagonists.