A hardcore gamer is reborn inside Dan-Katsu, a legendary RPG with 1,021 playable classes and more than 400 endings, and becomes its protagonist, Zephyrus. Thrilled rather than frightened, he enrolls in the Labyrinth Academy, where the main story unfolds, and sets out to claim the prized Hero class. He soon finds surprises: the Muscle Warrior, treated as a novelty pick where he came from, is respected here, and the hardest dungeons have never been cleared. To him, that makes the world feel like a brand new game. Eager to prove what a strong class really is, he recruits classmates, guides his shy childhood friend toward becoming an Alchemist and turns a selfish princess into a Saint. With a capable party behind him, he prepares to take on the dungeons in this action fantasy adventure with a touch of romance.