Erena Todo, a third-year UTX High School student, performs as part of the school idol group A-RISE with Tsubasa Kira and Anju Yuki. Her mature appearance features notable height, a slender figure, purplish-red hair, teal eyes, and a distinguishing beauty mark beneath her left eye.

Within A-RISE, Erena consistently displays respect and appreciation towards others, including rival groups. She readily acknowledges opponents as equals and openly praised members of μ's during their initial meeting, emphasizing that their core motivation is satisfying their audience—a fundamental principle guiding her approach to being a school idol.

Following μ's rise in popularity after New York, Erena and A-RISE interacted with Honoka Kosaka. During a significant rainstorm, after Tsubasa took Honoka on a late-night ride, A-RISE discussed the possibility of extending μ's career beyond their third-years' graduation. They proposed introducing Honoka to their management company, presenting a potential path for μ's to transition into professional idols, highlighting A-RISE's experienced role as mentors within the school idol community.

Erena Todo performs the songs "Shocking Party" and "Private Wars" with A-RISE. Her narrative involvement centers on her role in the group and their interactions with μ's, particularly concerning events leading to μ's final decision about their future.