The innocent and lovely girl Yuko Shiina (Isshiki Sae) has always been secretly in love with the handsome senior Katase (Kimura Takuya). She tried every means to get close to Katase and tried to win his favor, but all failed and caused a lot of trouble and jokes. A transfer student named Saki Aso (Uchida Yuki) came to the class. Saki has a beautiful appearance and a cold personality, and has a very bad relationship with her mother. It turns out that Saki has a crush on the older Mr. Komaki (Ryosuke Miki), but she finds out that Mr. Komaki really likes her mother. By chance, Saki kissed Yuko as a joke, and Yuko was surprised to find that she had unknowingly fallen in love with Saki. At the same time, Katase was also attracted by Saki's mysterious temperament, and a complicated triangle relationship began.