It is reported that in recent years, many elementary schools in Japan have been unable to carry out teaching activities normally because some junior students can't adapt to the new study life, so-called first-grade problems have emerged. Because the first-year students have received a certain degree of education before entering school or in kindergarten or have not entered kindergarten for pre-school education, there are certain differences in their acceptance ability and performance after entering school. Some Japanese education experts believe that with the increase of grades, the content and difficulty of learning will increase, and the achievement gap between students will further widen.

In view of this situation, Japan's ruling Liberal Democratic Party and government have begun to study and reform the compulsory education system, including preschool education, and plan to include kindergartens in the free compulsory education system and build a consistent learning system for kindergartens, primary schools and secondary schools. To this end, the Liberal Democratic Party plans to amend the Basic Law on Education, stipulating that preschool education should be included in the free and compulsory education system. The Japanese government also believes that the inclusion of kindergartens in free compulsory education is also conducive to encouraging women of childbearing age to have more children, so as to solve the problem of low birth rate in Japan.