Kotone is a lolita-like honor student who looks good in twin tails. Her father is always working, so she lives almost every day alone. However, behind her honor student face, she harbors a masochistic desire to be deep-throated and creampied. One day, she is seen masturbating by plumber Nakata, who blackmails her into having sex with him. Since then, she has become Nakata's sex slave and is trained in lewd acts...