Kento Yamada acts as the working patriarch of the Yamada household, holding a graphic design position with a flexible schedule that enables periodic remote work. His duties involve contributing to the family income while tackling the challenge of integrating a found kitten into a home forbidding pets. This demands discreet care for Chi, including covert veterinary visits and managing her concealment within the apartment, actions that occasionally make him the target of her temporary displeasure, especially after vet appointments or claw trims.

He consistently shows affection toward Chi, willingly providing food and allowing her to scratch his vintage jeans, understanding their texture satisfies her instinct to sharpen her claws. These jeans, recognized for their quality and durability, form a connection between them despite contrasting with the family's otherwise modest home furnishings. His quiet moments petting the sleeping kitten sometimes trigger her dreams of her biological mother, signaling his comforting role. His dedication solidifies when the family opts to relocate to a pet-friendly apartment, prioritizing her welfare over the upheaval of moving. This choice follows unsuccessful attempts to find her another home and underscores his part in securing her permanent place within the family.

Throughout Chi’s development, he remains a steady presence, adapting to her mischievous behaviors like playfully disrupting his workspace, investigating coffee cups, or reacting chaotically to household items. His patience endures through resulting messes or minor property damage. This flexibility also encompasses managing the complexities of pet ownership alongside parenting his young son, Yohei, balancing both relationships within the family dynamic. His core characteristics—dedication, quiet affection, and responsible caregiving—persist consistently within the primary narrative.