Saikyou de Saisoku no Mugen Level Up: Skill [Keikenchi 1000-bai] to [Level Free] de Level Jougen no Kase ga Hazureta Ore wa Musou suru

A sixteen-year-old named Makoto Sakura becomes homeless after leaving high school. A mysterious artifact appears to him, and soon dungeons start emerging worldwide. People gain a level system that reshapes their previous societal values. Makoto discovers his place within the dungeons, obtaining powerful abilities such as multiplying experience points by a thousand and unrestricted leveling. He rapidly reaches level 10,000 and becomes a formidable force. As one of the strongest individuals in this new system, he begins exploring the dungeons.