Kasumi and Mitsuki are twin sisters with a history of causing trouble for their home tutors. The MC is the latest tutor hired to help them, even though the sisters don’t see the need for his help.
However, things take a turn for the worse when the MC begins subjecting them to perverse and humiliating discipline sessions. Kasumi, the elder of the two, is forced to perform sexual acts that leave her feeling helpless. To protect her younger and innocent sister, she decides to be the only one targeted by the tutor’s twisted desires.
As the tutor’s depravity escalates, Kasumi finds herself losing control and giving in to his sickeningly pleasurable punishments. But with Mitsuki at risk of being subjected to the same treatment, Kasumi must find a way to stop the situation before it’s too late. Will the sisters be able to escape the tutor’s game, or will they be forever trapped in his twisted desires?