A teacher comes to the prestigious private high school Todai Shingaku. His name is Yoshizawa Tsuneo. At this school, there are many children of celebrities and a high rate of acceptance into Todai University. Yoshizawa is placed in charge of Class 3-D. On his first day, he is told by Yorita Asahi about the problems among Class 3-D and the fact that their previous 3 teachers have all quit in half a year. When Yoshizawa enters, he is ignored by the students. Yoshizawa doesn't care what happens, he continues to smile through it all. Eventually, the rebellious students get irritated by his unwavering cheerfulness and smile...