Eri Hozumi is the younger sister of protagonist Youhei Hozumi. She lives with her brother and their relatives in the Shinjyou Studio household. Eri spends most of her time at home, often immersed in television dramas that raise her brother's eyebrows due to their questionable content. Music is another interest, and she fills her time practicing the piano within the household. Eri possesses a curious and mischievous streak, frequently posing playfully probing or unusual questions to her brother about his romantic interests and relationships. Her interactions with Youhei occur exclusively within the Shinjyou Studio setting, and her activities remain largely confined to the home.