Known as 'nanashi' in the online game 'Attack Family,' Fumiya Tomozaki reigns as Japan's top player. However, in the realm of high school, his lack of social adeptness leaves him struggling. Blaming life's enigmatic rules for his friendless existence, he deems himself a bottom-tier character in this 'game.' A chance revelation unveils the second-ranked Tackfam player as Aoi Hinami, a popular, astute, and sociable classmate. Reciprocally surprised by their identities, Aoi takes it upon herself to guide Fumiya in conquering the 'ultimate game'—life. With her mentorship, Fumiya embarks on a journey to navigate the intricate challenges of social dynamics and human connections, gradually leveling up in the grand adventure of existence.