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Kotone Shirakawa
Identity: She is a somewhat quiet but very kind girl.
Background: Ayane's sister and Kazushi's childhood friend. She is the younger sister of the Shirakawa sisters. She's the quiet type but actually dies for bold things. Along with Ayane, he adores his childhood friend Kazushi like an older brother. Recently, she is worried that her clothes don't fit because her breasts started to grow again. She is still a high school student in Japón. She can be very permissive and accommodating.