Tomari Hinowa is a high school student living alone before his unforeseen marriage, having previously run away from home—a fact hinted by his self-embroidered apron bearing his partner’s face. Physically, he possesses a slim frame, pale skin, short black hair with pink-dyed tips at the back, and gray-blue eyes, typically dressed in his school uniform.

Initially hesitant and confused about his arranged marriage to Kanenogi, a large non-human creature, Tomari gradually forms a strong attachment to his partner, first drawn to Kanenogi’s soft fur. This physical bond deepens into genuine emotional affection. His resourceful nature emerges through creative acts like gathering shed fur to craft a felt doll replica of Kanenogi and embroidering the creature’s likeness onto his apron.

Tomari’s social circle expands when he joins classmates in similar marital situations, forming the "wives club." Key connections include Sora Hikurakawa, a confidant sharing experiences as a non-human spouse, and Ichiya Mokusaibashi, another classmate navigating creature marriage. Tomari actively participates in group discussions and activities about their shared lives. Within his marriage, Kanenogi shows affection through gentle head-chewing, while Tomari embraces his supportive role through domestic care and attentiveness to Kanenogi’s needs.

Later revelations disclose that such marriages stem from legal maneuvers where wealthy families adopted minor deities for tax advantages. Tomari’s character arc culminates in wholehearted acceptance of his relationship with Kanenogi, reflected in his continued involvement with the wives club and unwavering affection for his partner.