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Sumire who lives with her parents and a little sister has always lived the life of a performer. Having been thrust into show business as a child, she intensely devoted her formative years to the craft of pleasing an audience. She avoided extracurricular activities in an attempt to balance such a life, but after entering Yuigaoka High, Sumire would enthusiastically take on the idea of becoming a school idol. Sumire lives at a shrine and often helps out as a maiden. She enjoys studying Japanese and Japanese history.
Being in the entertainment world for so long, Sumire believes her experience and knowledge of its workings is second to none. Somewhat of a prima donna, Sumire assumes that most people already know her name. Somehow attached to the idea of her own stardom, Sumire dreams of becoming a famous school idol not just in Japan, but "across the galaxy." But Sumire also takes her more earthbound duty as a shrine maiden very seriously, warning those like Kanon to not aimlessly ask the gods to do everything for them, such as helping them become school idols. Instead, Sumire believes that they should do their best together without help from the gods and make their own wishes come true.
Her favorite saying is, "Faith will move mountains."
Along with Chisato, Sumire fulfills the smile attribute of Liella!
The shrine that Sumire is seen attending her duties resembles that of the real-life Onden Shrine in Shibuya. As established in Love Love! Days Vol. 13, the Onden Shrine is situated close to Yuigaoka High School.
The "Street Corner Galaxy☆彡" episode indicates that she had an interest to Isopods, as she tries to get one plush of it from a crane game, and chanted "Giant Isopods~" while trying to cleanse Kanon.