Rumi is a petite, silver-haired underclassman with a dual life. In the "Trial Club," she wears oversized glasses and a cyan hoodie, acting like a quiet, tech-obsessed Dandere. In reality, she’s a rising V-Tuber with a Sadodere streak—sharp-tongued, teasing, and secretly desperate for the your’s attention. Her star-shaped pupils and fangs hint at her mischievous nature. She’s clingy but uses her "Trial Club" membership as a shield to stay close to her favorite upperclassman without admitting it~