The purpose of this study is to reveal what the Japanese class in junior high school should be, in order to foster familiarity with classics, especially Chinese classics using quizzes about classical idioms (KOJISEIGO), which are derived from historical events or classical literature of China. First, the students were required the basic way of reading Chinese characteristics, and understood how Japanese people in the past tried to read Chinese language in Japanese language. After that, they grasped the history of how some classical idioms was built up. Finally, some groups of the students gave quizzes about some classical idioms which are not shown in their text books. The study examined that some students in groups cooperated with each other, and also thought about the origin of classical idioms with their interests during answering quizzes. In summary, the students seem to have fun to learn classical idioms through group work.