Onitsuka-kun, Sono Egao wa Hansoku desu

A love story between a cool guy who never smiles and a clumsy girl who never stops smiling! Natsuzubaki always smiles and follows the people around her. However, she often has a hard time dealing with the sharp remarks of Onizuka, a junior associate who has just transferred from a major company. (What he says is right on the mark, but...). One day, Natsubaki tries to overlook her boyfriend's flirtation with her with a smile, but Onizuka grabs her by the arm and says, “...you're really getting on my nerves." At first Natsuzaki is confused, but she gradually becomes attracted to Onizuka, who is blunt but concerned about her...?