Yohei and Sayumi are secretly in a relationship at work. Sayumi wants to be spoiled in private, but Yohei is cool and unwavering both at work and at home. One day, he blames Sayumi for the loss of an important document and berates her harshly. However, it is later discovered that Yohei had misunderstood. Angry, Sayumi tries to get revenge by causing trouble for Yohei...?!