Takanashi Shiori

She is the younger sister of Yumi, and is a confident and sassy-looking girl. She hates men and is very close to her older sister, Yumi, and pretends to be an honest girl in front of Yumi.

She is not comfortable with men who approach her, namely Masaya, and does not like it when he goes into Yumi's room. Of course, she is still a virgin because she hates men.

While she is usually strong-willed, she is fragile when she is subjugated or humiliated. Masaya uses the power of the notebook to humiliate the cocky Shiori and train her into an obedient bitch.