Ume Toranamon is a first-year high school student at the school hosting the ASMR Club, distinguished by her multicolored hair, aubergine eyes, and signature purple scarf. She frequently wears virgin-killer-style outfits and expresses fondness for yumekawa. Ume engages in social media livestreaming, channeling her contrasting personality traits: outwardly charming and gentle, yet harboring deep-seated negativity and complexes that occasionally surface in critical remarks toward others. She exhibits strong attachment to her name and reacts sharply to its misuse. Her attention-seeking manifests through livestreams, while affection often takes the form of teasing or provocative gestures.

Relationships define key interactions: She maintains ties with Panda Kuramae, her junior high underclassman now in high school. Tsurugi Kanegafuchi, the third-year disciplinary chairwoman, watches Ume with interest but avoids direct contact due to pride. Within the ASMR Club, Ume participates in group activities like playing house with Yuri's sister Toto—where Ume used a pacifier embodying the reincarnated protagonist Ore-kun—and collaborative efforts such as episode 11’s king game. Her contributions center on group participation and social media endeavors aimed at the club’s "ASMR Koshien" championship goal.