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Seiji Yagiri is aware of being stalked by Mika Harima, a girl who he remembered rescuing from a thug a week prior. Coming home and finding her in his apartment having seen something she was not supposed to see, he had to get rid of her. Seiji's sister, Namie Yagiri, was happy to come and dispose of the girl's body while promising to protect her little brother.
Who is the 'girlfriend' Seiji keeps referring to? What did Mika see in Seiji's house? Why does his sister have people so ready to dispose of a body?