Abstract
Taro is a typical fifth grader of Nishishiroyama Elementary School. His typical school day begins at 8.30a.m. and ends at 3.30p.m. He arrives home at 4.00. Coming home at 4.00, however, does not mean that he can enjoy the rest of the day. At 4.30 p.m. he leaves home for a Shingaku‐Juku. He studies arithmetic there until 7.45 p.m. and then comes back home. After supper he begins to do his homework assignments.