Hero from another world Ukei Kaito who killed the demon king was betrayed by his own comrades and killed, as he slowly died Ukei swore revenge on all those who laughed as he died, as he breathed his last breath he heard a message in sus mind "you finished the tutorial" (his tutorial lasted about 4 years), when waking up again Ukei was at the place where he was summoned 4 years ago, seeing all those depressed people in front of him he starts a massacre in that room, and thus begins Ukei Kaito's revenge story anime where the mc is betrayed and becomes op.
