Megumi Ayase reigns as Parthenon Productions' top idol, clashing professionally with Creamy Mami after the latter’s sudden surge in popularity. Her rivalry stems from insecurities about her agency standing and unresolved romantic feelings for president Shingo Tachibana, sparking heated confrontations marked by impulsive actions—such as slapping Shingo—that expose her volatile temperament.

Having built an 18-year pop idol career before Mami’s debut, Megumi hides a fear of heights that subtly shapes her interactions. In the OVA *Eien no Once More*, she collaborates with others to investigate rumors of Mami’s return, highlighting her enduring focus on career stability and complex interpersonal dynamics at Parthenon.

Though spin-offs provide no expanded backstory, Megumi’s narrative centers on professional envy and romantic tension. Her interactions consistently mirror her core traits: a fiercely ambitious yet emotionally vulnerable idol navigating industry pressures, where insecurity and rivalry drive her every move.