Nanase Tsukumo is the homeroom teacher overseeing Yuuta, Rikka, Shinka, and Makoto’s class. With short brown hair, blue eyes, and a polished professional demeanor, she balances a calm, reserved nature with quietly attentive care for her students. She enforces fairness and accountability, correcting errors with measured discipline while fostering a respectful classroom environment. Her supportive side emerges when student efforts align with responsibility, such as approving Rikka’s club request after the group tidies a cluttered school room, showcasing her encouragement of structured initiative.

Her given name, Nanase, merges the characters for “seven” and “rapids,” while her surname, Tsukumo, means “ninety-nine.” Introduced in the anime’s first episode, she appears consistently across both seasons and supplementary light novels. She is also credited in the film *Love, Chunibyo & Other Delusions the Movie: Rikka Takanashi Revision*, maintaining her presence within the franchise’s expanded narrative framework.