In the last stronghold of humanity, Novatlanta, Harriet Laskaris, the reluctant Hero of Humanity, struggles to navigate a destiny he never chose. Burdened by the weight of the expectations placed upon him, he's unsure whether he even wants to be a hero. But everything changes when he encounters Rangi Ifgenia, a mysterious man whose immense strength forces Harriet to confront the path he's been avoiding. Together, they face the monsters of the Dungeon, a parallel realm to Novatlanta, where dangers lurk at every turn. As Rangi's power challenges his own limits, Harriet is pushed to become the hero the world demand—though it may not be the hero he wants to be.