Monster Lord: Reincarnated

Trapped in an endless cycle of self-destruction, our protagonist finds himself pulled away from the comfort of his life. By dying!

This is the story of a NEET, and self-proclaimed Pro gamer who dies in a fit of rage after losing a league match. He then finds himself forming a contract with a stranger in a sea of darkness. To survive, he will have to reincarnate in a strange world, filled with monster cuties! Will he do the stranger bidding? Will he bang everything that moves? Hell yeah!

[From Itch.io]