Sadohara Kazuha is known as the perfect girl for both boys and girls. She is also known as the professional girlfriend at school. However, little people knows that she is in love with a "mob" character, Takishima Shouto . She consults with her childhood friend, Yahagi Subaru in order to fall in love with the super-rich mobster, Takishima, and a battle for love with all sorts of tactics and strategy to win him over.

This is the opening of a twisted romantic comedy about a professional girlfriend vs. a mob guy with a 120% hassle factor!