Kiri's mother is a famous special effects make-up artist in Hollywood. Even after years of Emi living in LA, Emi and Seiji's marriage has never been strained and the two keep in touch through email. Despite being a kind person, she turns very fierce and somewhat unreasonable once someone threatens Kiri. Iori usually calls her 由 the name "Emily". Although she was married at that time, she got proposed to 由 Minamoto Iori, which made Koshiba Seiji, her husband, VERY jealous. She loves Kiri so much and she would come from America flying in one 秒 if she knew that Kiri was threatend, bullied, 或者 annoyed.