Hinagiku, a second-year student in the Sunflower Class at kindergarten, carries herself with a maturity beyond her years as the daughter of a yakuza clan leader. Her calm, dignified demeanor starkly contrasts with the playful chaos of her classmates. Though her father insists his group is a nonprofit organization, she publicly corrects him, asserting authority over both him and his subordinates through a poised mix of traditional etiquette and unwavering resolve.

Her life shifts after an incident involving Tsuchida, a kindhearted teacher who aids her. Convinced he embodies the ideal partner, she vows to marry him, sparking a rivalry with Anzu, another student smitten with Tsuchida. Their competition unfolds through inventive, lighthearted schemes to win his favor, balancing rivalry with mutual respect.

Rooted in her surreal yakuza upbringing, her father’s associates treat her with reverence, amplifying her commanding presence. She navigates Tsuchida’s discomfort toward her family ties with steadfast determination, undeterred in her pursuit. Traditional Japanese attire reinforces her grace, setting her apart from peers.

While her long-term evolution remains unspecified, her role as Anzu’s composed rival and her dual life—bridging ordinary kindergarten adventures with her clan’s unconventional world—highlight her layered resolve and adaptability.