This paper examined the actual circumstances of the recent teacher shortage in public elementary and junior high schools in X Prefecture. Although teacher shortages had been reported, few previous studies had investigated them empirically. With the cooperation of all five branch offices of the Board of Education, data were collected through three surveys: 1) a questionnaire survey in June 2021 of the branch offices, 2) three interview surveys in July 2021 of the administrative officers at the town level, and 3) a 2019-2021 visiting survey of the branch offices of X Prefecture and of four towns. First, the actual amount of shortage as of May 1, 2021 was scrutinized by the questionnaire survey, clarifying the shortage into three stages. 1) Positions for 1,971 full-time teachers with tenure were unfilled as the first stage. 2) Teachers without tenure were subsequently recruited, still leaving 150 unfilled positions as the second stage. 3) Finally, part-time teachers were recruited, still leaving 115 unfilled positions as the third stage. 4) In the end, each school was required to manage by themselves. This survey also made it clear that the teacher shortage increased in each term because more and more teachers left work due to childbirth or illness, with no substitutes. This suggests that the design of the first national teacher shortage survey by the Ministry of Education in July 2021 should be redone, as it focused only on the condition of the first term. Second, the paper disclosed that the teacher shortage had increased since 2018 in this prefecture. This was caused by multiple factors at micro/mezzo/ macro levels at each stage. 1) There were three background factors for the first stage. (1) Although the numbers of teachers were strictly determined by national law, the government had made no improvements for 41 years. The local government had additionally decreased teacher numbers in order to prepare for a teacher surplus in the future, based on the declining birthrate. However, teacher demands were enlarged by the increase of children with special needs. (2) Administrators were reluctant to hire teachers with tenure. The risk of the prohibited surplus of teachers was multiplied because of the increased number of small and mutable special education classes. (3) The applicants for hiring exams decreased. Teaching itself was not as attractive as before. (4) Maternity leaves not only increased but grew longer. 2) The shortage in the second stage was caused by the lack of teachers without tenure. Few teachers were on the candidate list because most of them were already hired with tenure. 3) The shortage in the third stage was caused by the teacher license renewal system, which began in 2009. Many licenses were already expired. Third, the effects of the shortage were examined, finding that teachers were compelled to overwork because each school had to cover 3.91 teachers' worth of absence as a team. The paper also found that 60% of current teachers had less than 10 years' experience, which is expected to have negative effects both on the quality of teaching and the professionalization of teaching.