When Aii and Koon are heartbroken by the same person, the two take comfort in each other and find they have a lot in common. Given all the time they're spending together, to make things easier, they agree to live together.

As their closeness grows, Koon's bandmates attempt to persuade Koon to act on what they sense goes beyond friendship. Afraid of losing what they have but also of losing Aii if he can't return his feelings, Koon proposes a twenty-one day experiment to see if Aii can make him fall for him.