Follow the gripping tale of Iuma Suzuki, a neglected teenager sold to a demon named Sullivan by his own parents. Transported to the dark realm of the Netherworld, Iuma embarks on an unexpected adventure. From attending demon school to making quirky new friends like Clara and Asmodius, Iuma navigates through challenges, spells, and even summoning mishaps. Join him as he discovers his true potential and faces the trials of his new demonic life.