Meikyuu Metro - Mezametara Saikyoushoku Datta node Shima Risu o Tsurete Shinsekai o Aruku

One hundred years in the future, Tokyo has been irrevocably transformed by a catastrophic event known as the "Tokyo Referee," which triggered a devastating collapse. From the ruins, a new nation called "Shin Tokyo" was reconstructed, but its depths remain perilous. Satoshi awakens on the fiftieth basement floor of the Otsuka Metro, a sprawling underground labyrinth now overrun by dangerous creatures known as metro beasts and plagued by the rampant contamination of super fungi. Despite the overwhelming odds, Satoshi refuses to succumb to his grim surroundings. Accompanied by his unlikely partner, a chipmunk named Tamiko, he begins a desperate ascent toward the surface. To survive, he must hunt down the metro beasts and consume their spores, a process that allows him to level up and acquire powerful new abilities known as bacterial skills. Together, this lone hunter and his small companion navigate the treacherous depths of the flooded subway system. Their journey is a relentless fight for survival through a strange, hostile new world, driven by the singular goal of escaping the subterranean nightmare and reaching the surface above.