Prof. Suzuki highlights the importance of article 9 of Japan's constitution. He notes LDP interest in changing it and opposition party commitments to article 9. The Library of Congress has a booklet devoted to article 9.
The text of article 9:
1. Aspiring sincerely to an international peace based on justice and order, the Japanese people forever renounce war as a sovereign right of the nation and the threat or use of force as a means of settling international disputes.
2. In order to accomplish the aim of the preceding paragraph, land, sea and air forces, as well as other war potential, will never be maintained. The right of belligerency of the state will not be recognized.
Some lesson plans tied to the article:
Foreign Policy Research Institute (2016 examples)
University of Kansas NCTA