What? Sui-chan... has a boyfriend!

That day, I received a shocking confession from my best friend Akemi Mizushiro that she had a boyfriend. The boyfriend was Tatsumi Matsui, a popular and handsome guy at school. As a shy person, I congratulated Sui-chan on her relationship as she was the only friend I had at school, but gradually I felt that her appearance and behavior were getting worse. In the midst of this, I learn that Tatsumi is planning to trap Sui-chan and turn her into a bitchy gal.

In order to protect my best friend, I go to Tatsumi to ask him to break up.

"I'm going straight to the point. Please break up with Sui-chan..." "What are you talking about? I'm not sure what you mean by that, but I'm pretty sure you're Sui's friend, aren't you?"

And then Tatsumi offered a condition: in exchange for my best friend, she would give him her body as a "substitute".

Tatsumi, who likes bitchy gals, forces me to perform a number of perverted acts and transforms my appearance into that of a bitch. Before long, I find myself falling deeper and deeper into his clutches and even my heart is being "transformed"...