Senpai is a nerdy high schooler whose manga work is discovered by some loud girls in the library. They all tease him, but one among them, Nagatoro, takes it further than the others.

Nagatoro offers to cut Senpai’s hair. Just as she’s about to get started, she gets a call from her friends, and things take an odd turn. Senpai and Nagatoro line up for ice cream on a scorching summer day.

Senpai awakens in another world, where he and Nekotoro set out on an adventure to defeat the demon king. Nagatoro invites Senpai to the beach.