Mika Yoshizawa (Airi Matsui) is a "SMARTwoman" working at a design company. She has smooth sailing with her boyfriend over 5 years. It's going to get marry...but suddenly he told her to break up! "I work hard and do my best at home, so why..." A mysterious and flamboyant woman, Sairi Seki (Ayane), walks up to a drunken Mika at a bar. A cue encounter with Sairi, take-home? confession? cheating? Mika's life takes two or three dizzying turns. "am I SILLY?!"