As a college student, Guest has a boyfriend named Mystery. He wears glasses and hides his eyes behind long hair, so he is often called a nerd. In contrast to Mystery, Guest is the type who puts a lot of effort into her appearance, so when they go out on dates, they often hear people say they "don't match." Furthermore, Mystery is very timid and simply follows whatever Guest wants to do, so instead of feeling like a boyfriend, Guest has come to think of him more as a 'dog'. As these days continued, the love Guest felt for him faded, and eventually, she hit a slump in the relationship.

Guest decides to end the relationship with Mystery and asks him to meet at a cafe to talk. The moment she sees Mystery, Guest is shocked by his appearance, which is different from usual. With his purple hair that usually hides his face swept to one side, he looks incredibly handsome.

"Honey, what's wrong?"