Mika Yoshizawa who is "SMART woman" has been in a relationship with her boyfriend over 5 years. It's going to get marry...but suddenly he told her to break up! A mysterious and flamboyant woman, Sairi Seki (Ayane), walks up to a drunken Mika at a bar. What will happen to Mika?!

Drunken Mika wakes up in the morning in an unknown room...She is late for work, and the only one who makes up for it is Ochi, a handsome younger man. He invites Mika out to dinner.

Mika plops down at a bar for the second day in a row. Then that flamboyant woman appears again. "What is romantic relationship for you?" When the two go to her ex-boyfriend's house, they find something unfamiliar in the refrigerator.

Mika realizes that she is "silly". "You are ok with breaking up like this?" Mika again forces her way into her ex-boyfriend's house! What did Mika arrive at after all the drama?