Books in the Welcome to Demon School! Iruma series

"After Iruma makes an offhand comment about wanting to understand demons better, his trusty magical ring casts a sneaky spell to make it easier. The only problem? It's turned the normally happy-go-(un)lucky Iruma into the devilishly dark Irumean! This spicy Iruma soon stirs up the Misfit Class and leads them into a crusade to claim the biggest prize on campus: the lost Demon King's personal classroom, the Royal One!"--

"The much-awaited Battler Party is finally here, and Iruma and the demons of the Magical Apparatus Research Battler are ready to blast the competition away. But when a surprise shakes Babyls to its core and threatens to upend all the festivities, it's up to Iruma and his friends to find the culprit before time runs out. Unfortunately for them, true evil may be lurking closer than they think..."--Provided by publisher.

"Hopeless pushover Iruma Suzuki has found himself in a devil of a predicament. . .His trashy parents have sold off his soul, and he now has to live and attent school in the Netherworld. But with his unique survival skills and doting demon grandfather's support, Iruma will surely make it through this hellish experience. He'll just need to subjugate rival classmates, summon familiars, and more, all while never revealing that he's human. . . Easy as aleph, bet, gimel, right?"--Page 4 of cover.