Shinya Uchida is the son of Mr. Uchida, who becomes Eriko Tamura's legal guardian after her father's death and her mother's coma. Having known Eriko since childhood, Shinya shares a longstanding close relationship with her, often called by the nickname "Ka-chan". When Eriko moves into the Uchida household, he provides consistent emotional support during her challenges in the idol industry and her mother's hospitalization, demonstrating concern through actions like visiting the hospital with flowers. Over time, his childhood friendship with Eriko develops into romantic feelings. He confesses these feelings, resulting in them becoming an official couple. No concrete information exists regarding Shinya Uchida's depiction in spin-offs, movies, OVAs, or other expanded media.