One day, Yamato Onitsuka, an office worker, kills another man who attacked him. When he took that man's life, a sound effect rang in his... more>> head informing him of his own strengthening and the acquisition of a spell. He had become a "murdelizer", a being whose level goes up when he kills someone. Yamato Onitsuka resolves to survive even if it means killing people as and to keep on living he needs to kill someone within a week or he will die. <<less

Makoto Sakura, sixteen years old, finds himself without a place after dropping out of high school. Suddenly, an otherworldly relic appears before him. On that day, dungeons began to appear all over the world. Humans acquired a level system that completely overturned their previous values. Amidst this revolution, Makoto finds his place inside the dungeons.... more>>

Acquiring cheat skills like “Experience Points x1000” and “Level Free,” he becomes a level 10,000 powerhouse. As the strongest “Player,” he embarks on dungeon exploration! <<less