Takashi Takahashi is a first-year student at Kawanuma East High School, serving as the student council treasurer. At 15, he has a short stature and an androgynous appearance. His neighbor, Hikari Hazakura—a spirited physical education teacher with a mischievous streak—is affectionately dubbed “Hika-nee” by him due to their close proximity. Though frequently subjected to her playful antics, Takashi reveals steadfast compassion and reliability during her emergencies, tirelessly resolving problems. Their relationship begins with casual familiarity, but mutual feelings slowly emerge through evolving interactions. Hazakura maintains her carefree demeanor around him yet prioritizes his well-being, eventually fostering a romantic bond. The dynamic transitions from her one-sided teasing to a balanced partnership, as she recognizes his maturity and dependability in pivotal situations. Their connection deepens until they formally begin dating, solidifying a transformative shift in their relationship.