The Weakest Boy Surpasses the Strongest and Shatters Common Sense!Kai no Sekai wa Kami no Me de irodzuku ~Ore dake mieru Status de, Saijaku kara Saikyou e kakeagaru~; 灰の世界は神の眼で彩づく～俺だけ見えるステータスで、最弱から最強へ駆け上がる～; The Gray World is Colored by the Eyes of God: Rising from the Weakest to the Strongest with the Status That Only I Can See

A world where dungeons have appeared and humans have acquired magical powers - here, the amount of magical power one is born with is an index of your strength. Amachi Kai, the weakest conqueror with little magical power, is challenging the dungeon to earn money for the medical expenses of his sick sister, Nagi. However, Nagi's condition suddenly worsens. A huge amount of money is urgently needed for her treatment--!? In a dilemma, Kai recklessly participates in the investigation of an unknown dungeon with a large reward at stake...