Reiko Minami teaches at the middle school attended by Matsutarou Sakaguchi, whose romantic fixation centers on her. She tolerates his classroom antics, oblivious to his feelings, and inadvertently becomes the catalyst for his abrupt transition to sumo wrestling in Tokyo. Her relocation coincides with her resignation from teaching, spurred by guilt after Matsutarou and colleague Nishio face arrest during an impulsive excursion she permitted. Settling near the Raijin sumo stable, her proximity steers Matsutarou’s decision to join, allowing him to stay near her. While championing his athletic efforts, she maintains a detached, mentor-like stance, misinterpreting his dedication as mere ambition. Her romantic ideals fixate on men demonstrating sumo wrestlers’ disciplined vigor, which she associates with mature masculinity.

Family pressures thrust her into an arranged courtship with a socially suitable match, provoking Matsutarou’s impassioned confession. She rebuffs him, insisting her encouragement merely reflected pedagogical duty. Yet she ultimately refuses the arranged union, her resolve softening as she observes his tenacity in the sumo world. Over time, she reconciles her professional regard for his athletic progress with an awakening romantic reciprocity, leading to their marriage.

Her arc traces a transformation from disciplined educator guarding formal boundaries to a partner valuing Matsutarou’s tempered perseverance over his lingering impulsivity. Their union crystallizes her acceptance of his dual identity—both the unruly student she once managed and the determined wrestler he becomes—bridging her admiration for his craft with private affection. The narrative threads their bond through themes of self-reinvention and the blurred thresholds between mentorship and love.