A self-deprecating short-statured boy known only as Conte-kun attends a private all-boys school in Hiroshima Prefecture from the first year of middle school through the third year of high school. Because he stands barely over 150 centimeters, he is immediately cast by his classmates into the unofficial role of the school's "princess," a position that carries both affectionate teasing and genuine comradery. Conte-kun's daily life is a low-stakes, episodic tour through the peculiar ecosystem of a same-sex educational environment: the boisterous lunchtime debates, the bizarre hierarchies of the club activities, the chaotic sports festivals where gender-separated competition takes on its own absurd flavor, and the strange rituals surrounding school festivals and joint events with neighboring girls' schools. The cast revolves around a rotation of archetypal classmates who recur throughout the volumes: the loud and physical embodiment of "all-boys-school energy," the older-looking and tall member of the physics club, the socially awkward "komaru-type" who overcomplicates simple interactions, and the easygoing friends who simply enjoy the ride. Teachers also appear as distinctive personalities, adding their own quirks to the closed world. Narrative arcs are loosely organized around the school calendar: summer training camps for the brass band club, the buildup to the cultural festival, the fraught atmosphere of parent observation days, graduation ceremonies that carry unexpected emotional weight, and the strange hollowness that follows commencement. Conte-kun also recounts his first experiences with cross-dressing for a school event, the culinary chaos of a cooking class full of boys, the competitive madness of the cheering squads, and the understated camaraderie of trips to the convenience store after club practice. Underneath the surface comedy runs a persistent thread of nostalgia: these are not extraordinary events but ordinary moments elevated by the author's affectionate recollection. The manga emphasizes that a world full of boys, despite its lack of异性, generates its own rich culture, humor, and unexpected tenderness.