Multi-Gene by Typhlix

The enemies have no value to the story, the extras have little function but this story shows the extras that don't make a difference in appearing or not appearing. The protagonist breathes and finds enemies, he killed a strong monster, two extras appear who saw it and just thought that MC found the dead animal and wanted to steal it if he was going to be a villain, why don't they say that they waited for the MC to finish the fight, to steal their prey. The fights are too forced and the power level confuses , the guys with low level skills tied with a high level skill that the MC has, he has no allies but some extras appear and tell him to go with him and he will then he have a problem. I gave up on the story when I wondered why he was following a nonsensical story.

chapters 1-600 he time travels? and starts a school arc till he explodes and travels to another world... and from 600+ he is reborn as a 10 yr old and goes to school again and learns new techniques with regaining strength......