Magical Angel Creamy Mami and the Spoiled Princess Vol. 3 (manga)
Life gets super rough for idol Megumi Ayase when starlit (and magical!) Mami joins her agency and inadvertently usurps the top spot. Rather than backing down, Ayase leans into her jealousy and will stop at nothing to reclaim her throne…all while still doing her best to be a good senpai!