The Retired Big Shot's Laid-Back Life

After returning from an infinite world, protagonist D resolves to spend the rest of his life being a slacker. But then an infinite world falls from the sky, forcing Earth's residents to take part in a selection tournament to choose a hundred elite players capable of clearing the final level. To achieve his goal of being a slacker, D decides to cling to his handsome next-door neighbor and lie back, shouting, "666!" Who knew that the more levels he cleared, the more familiar everything started to feel? D: ...Wait, isn't this my mortal enemy from the infinite world?! Handsome next-door neighbor, adoring expression: My little brother is so cute. He's nothing like a certain mortal enemy. Content warning: 1. One-on-one romance, both leads are max-level experts. Theme: Evil never triumphs over good, and justice lasts forever