Welcome to Demon School! Iruma-Kun 6 (manga)

Fresh off the stage where he made his dem-dol debut, Iruma discovers an astounding new aspect to his magical ring and is caught in a compromising moment by the student council president, Ameri. Horrified, she resolves to whip Iruma into shape and has him temporarily join the student council in all their grueling routines. But even the symbol of Babyls has her enemies, and when disaster strikes, it’s up to Iruma to help keep both the president and all sense of order in the demon school from crumbling.