Tsukasa Fuyuki, a junior colleague who is well-liked by everyone at work and good-looking.
The protagonist, Akane, has trouble dealing with Tsukasa, who is the complete opposite of herself.

One day, while they were actively avoiding getting involved with one another, their boss suddenly orders them to go on a business trip together. Akane is bewildered, but Tsukasa says "I want to be friends with you" in a friendly manner, and closes the distance between them.
Akane grows distrustful of the situation, but...

The day of the business trip. Akane becomes drunk due to her unfamiliarity with wining and dining in business relations environment, and Tsukasa ends up taking her back to the hotel.
Tsukasa gently comforts Akane, who laments about having caused him trouble.
Akane's nervousness eases due to Tsukasa's kind attitude, and she begins to feel that perhaps he's not such a scary person after all...

Then suddenly, he pushes her down on the bed and...