The main character, Wakaba Asakura, is dating a woman named Yayoi Yoshimine.
She is a woman of talent and beauty who is admired by everyone for her work.
After making a passionate approach to her, Wakaba gets her OK and after living with her, they find happiness in their life together.
However,...... the only strength he could boast of was that he was "Yoru Yoi's boyfriend".

One day, Wakaba is assigned to a big deal that comes into his sales department,
The client was Takumi Suzuki, who had bullied her in her school days.
With the support of Yayoi, who accompanied him on the sales trip, the negotiations seemed to be a success,
However, the negotiations were suddenly cancelled later that day.
Wakaba is depressed, and Yayoi, unable to stand by and watch her boyfriend make such a mistake, decides to negotiate directly with Takumi.

Takumi realizes that Yayoii's true feelings are not to be depended on, but to be a woman who depends on her boyfriend,
In fact, she wants to be spoiled by her boyfriend.
And as he looked at Yayoi's fleshy body, an evil tingle welled up inside Takumi.
He thinks that he will bring out the true sexuality of Yayoi, which Wakaba will never be able to see.