Itoshi Kingyo is a collection of five standalone short stories plus a bonus sidestory, each exploring moments of fragile romance and quiet heartbreak. The volume opens with its title tale, set seven years after a girl received a goldfish at a summer festival—a fish she named after her beloved childhood friend, Jin. As Jin prepares to leave home, the goldfish becomes a symbol of the unspoken feelings and uncertain future between them. The story unfolds with a bittersweet tension, capturing the ache of a love that may never be returned. The remaining stories shift to other characters and situations: a girl grappling with her real intentions in a relationship, a romance under the stars, a meditation on life painted in white, and a story about the power of a single voice. Each narrative is anchored by emotionally charged moments of tenderness and regret, with characters such as Sou, Yuuya, Yuika, Tomoharu, Yae, Miyo, Kawasaki Mizuho, Ootsuka, and Michiaki navigating first loves, parting ways, and the subtle tragedies of everyday life. The collection moves through a range of settings—school hallways, summer festivals, quiet rooms—while maintaining a consistent tone of earnest, mature shoujo storytelling that lingers on what is left unsaid.