The Demon King who brought darkness to the world has been defeated by the hero, and the light has returned. But the Demon King leaves a part of himself behind as a successor known as Valaris III. To regain their reign of darkness, the new Demon King ventures out of the demon castle and heads to the human world, only to emerge from a toilet in a modern Japanese high school. Stripped of most of her powers, Valaris III must navigate everyday human life as a transfer student in Class 2‑B, where stairs become treacherous obstacles and sports equipment turns into absurd weapons. The series unfolds as a reverse‑isekai comedy, mixing fantasy tropes with school‑life slapstick and heavy doses of toilet humor, visual gags, and fourth‑wall breaks.

At the center of the story are Valaris III, the bumbling demon heir desperate to restore darkness, and Akira Kumon, a transfer student with a mysterious past who can see through Valaris’s illusions. Instead of reacting with fear, Akira treats her like an odd foreign exchange student, his deadpan refusal to acknowledge the fantasy nonsense becoming a running gag. Other students and staff gradually populate Class 2‑B, including the supporting characters Gimsun, Hayashi Futoshi, Durgolem, Haranishi Surume, and Kaichou Masaru, each adding to the chaotic daily life.

The early narrative arcs focus on Valaris’s humiliating attempts to fit in and her clashes with mundane human obstacles, while hints of a larger conflict emerge from the demon world and the hero’s lingering legacy. The tone remains proudly immature and self‑aware, leaning into Sorachi’s signature style of relentless comedy that can occasionally pivot toward more serious stakes. The manga is ongoing, with new chapters published weekly.