Izumi Watanuki manages Starlet Promotion’s idols, balancing professionalism with the group’s emotional dynamics. Her calm demeanor contrasts with colleague Itsuki Segawa’s anxiety-prone approach, yet both navigate crises—such as Izumi recruiting Mao Otoha to assume Hana’s identity after Meisa Hinata’s abrupt departure. This decision stemmed from Izumi’s guilt over prioritizing Hana’s career demands above Meisa’s personal aspirations.

Known as the Team Mom, she nurtures the idols through challenges, safeguarding their public personas while enforcing secrecy around Mao’s dual role until Mao opts for disclosure. Her interactions blend practicality with warmth, including a playful fondness for charming elements like coaxing a colleague with a hedgehog.

Sala Itoi’s affectionate nickname "Izumin" underscores their collegial bond. While Izumi’s background remains undisclosed, her actions prioritize adaptability and responsibility, mediating between the idols’ obligations and individual growth. Her documented contributions remain confined to the primary series’ narrative framework.