Meikyuu Metro

Abe Shuu wakes up in a drastically altered Tokyo 100 years into the future, finding himself on the 50th underground level of the Ootsuka Metro, now a monster-infested maze. Lost and unsure of his next move, he meets Tamiko, a chatty female chipmunk. Together, they attempt to navigate the maze and reach its end. Despite being at level 1, Abe possesses an immortality skill and hopes to become the strongest. He acknowledges the difficulty of achieving this alone but believes it might be possible with Tamiko by his side. Their journey begins as the weakest hunter teams up with a magical beast companion.