Due to her mother's recent paralysis, Yuzu Horiuchi transfers from a prestigious all-girls high school to a co-ed school, struggling to adjust to her new environment and a very different daily routine. She meets the seemingly quiet Soutarou Kashio at a puppy adoption gathering, where both become enamored with the same Shiba Inu puppy they name Shiba. Neither initially claims they can take care of the dog, but when the puppy goes up for adoption, Yuzu loses a bidding war only to discover that Shibas new owner is Soutarou. Refusing to give up the pup, Yuzu proposes a compromise where she pays half of Shibas expenses and they share joint custody. The story follows Yuzu and Soutarou as they raise Shiba together, navigating their unusual arrangement and growing closer as pet owners, friends, and potentially something more.

Yuzu Horiuchi is a naive girl but not an airhead, trying to adapt to a more open school atmosphere after leaving a prestigious girls school. Soutarou Kashio is not depicted as the typical popular male protagonist, coming across as reserved and quiet. The Shiba Inu puppy serves as the central catalyst that repeatedly brings the two characters together, forming a special bond between them throughout the narrative.

The manga is set in a contemporary Japanese high school environment, contrasting Yuzus previous experience at an all-girls school with the co-ed setting she now navigates. The story primarily unfolds across school scenes and moments involving the shared care of the puppy, with the dog serving as the emotional anchor that forces continued interaction between the leads.

The main narrative arc revolves around the joint custody arrangement and the unspoken romantic tension that develops as Yuzu and Soutarou spend more time together caring for Shiba. The story follows a basic shoujo theme of boy meets girl but distinguishes itself through the pet ownership premise. The narrative is relatively light and focused, developing its characters over a compact timeframe as the relationship between Yuzu and Soutarou progresses from strangers to reluctant co-owners to potential romantic partners, all while the puppy remains the constant thread connecting their lives.