Hiyori is Zen Kirishima's young daughter, around 10-12 years old and currently in primary school. She's deeply attached to her father—something that comes through clearly in how she interacts with him. Beyond her immediate family, she's developed a solid relationship with Takafumi Yokozawa, Zen's partner and the story's protagonist, calling him "Yokozawa-oniichan" or just "onii-chan" in a way that feels natural rather than forced.
Her mother, Sakura, passed away when Hiyori was still quite young. Those who know her often note how much she resembles her mother in appearance—a bittersweet detail that carries some weight in the story.
Content compiled by AnimeList.moe from publicly available sources.
