Reborn, I Steal Talents Nonstop

Regular guy Ethan unlocks an overpowered SSS-rank talent that lets him steal other people's talents when the Doomsday Game hits, only to get betrayed and killed by his girlfriend Cecilia and rival Tristan, who steal his talent for themselves. Reborn to day 1 of the game, he uses his future knowledge to save the doomed Rachel, takes Cecilia's fire talent for himself, and sets out for revenge.The two clash over a mind-stabilizing artifact, so Tristan frames him as a "talent-stealing devil" and sets a death trap in the final dungeon.