The story takes place on Christmas Eve, when the festive atmosphere is strong. A mysterious letter brings five men with different personalities together in a seaside hotel called "Sea House". They are the super narcissistic Sugimoto (played by Yamada Takayuki), the playboy but unlucky Nekoda (played by Muro Tsuyoshi), the carefree and impetuous Nishina (played by Koyanagi Yu), the shark lover Matsuyama (played by Yamamoto Yusuke) and the owner of the Sea House (played by Sato Jiro). The woman who wrote the letter is named Eriko (played by Toda Erika). In the days when they used to live together, Eriko, who has a pretty face and a cheerful personality, has become the object of common admiration. This time, after receiving Eriko's letter, they all firmly believe that they are the one that Eriko really likes. As time passes, a figure appears at the door of the Sea House. However, this person is not Eriko, but a lawyer who has been trying to demolish the Sea House.