Midori is a young girl who is in the same grade as Rie Komatsuzaki in the all-girls Catholic school who is also the girlfriend and right-hand of Naomi Hayakawa. She is invited by Naomi to join in a three-way between her and Rie. As the right-hand of Naomi, she informs her of girls who get close to Rie, girls named Mari and Arisa and she brings these girls to Naomi's villa to engage in their sexual games, and Rie is made to take their innocence. In the second episode of the Escalation series, she accompanies Rie to Naomi's villa to partake in her S&M game, in which a captured Mari is an unwilling participant, much to Rie's shock. Midori is also prone to getting aroused quite easily seeing Rie engaged in a sexual act and pleasures herself while watching her. However, at one point she had forgotten her place and Naomi punishes Midori by whipping her.