- Voice Actor (CV)
- Sumire Morohoshi
- Role
- Supporting
- Identity
- A sixth-grade elementary student who attended both a summer forest camp and a Christmas event
Personality
Precociously mature
Quietly reserved
Fiercely independent
Sharply perceptive
Rumi Tsurumi is an elementary schooler whose composed and detached demeanor sets her apart from her peers. She first crosses paths with the Service Club during a summer forest camp, where she finds herself ostracized by her classmates. Her quiet solitude resonates deeply with Hikigaya Hachiman, who recognizes a kindred spirit in her. After Hachiman intervenes by dismantling the social clique isolating her, Rumi remains a loner—but is no longer a target. She reappears at a Christmas event, demonstrating a level of insight and self-reliance that far exceeds her age.


