The protagonist has an evil desire for his stepmother, Emi Shirotsuka, who is married to his father.

In order to relieve his uncontrollable urges, he plans to use hypnosis to play with his stepmother's voluptuous body.

"I should never have become a family with you. You're the worst!"

The stepmother is disgusted and angered by his commands, but she gradually begins to experience pleasure while she is unable to move due to the hypnotism.

When the father discovers her lasciviousness, a distorted family love is brought into fruition by hypnosis.

[From official site]