After being summoned into another dimension as one of the five heroes destined to defeat a demon lord, Touya Houjou awakens his hero power only to discover that... it's an unlimited bath?

Kurono Kokuya is the lowest ranking student at Star Gate Academy, but can he and his childhood friend (and the world’s strongest star sorcerer) Yukihime Yukigane save the world from the Dark Lord Redge?