The place of the Diet in the Japanese constitutional system is a subject of some controversy. Jurists of the old school, typified by the teachings of Hozumi, tend to minimize the representative character of the legislature and to magnify the limitations of its authority, while the new school, led by Minobe, stresses the possibility of parliamentary development.
The basic difference between the two schools is found in their respective attitudes toward the theory of separation of powers. Hozumi holds that the kokutai, or fundamental nature of the Japanese state, is unique. The Emperor is not merely an organ of the state. He is the state. He retains the tochi-ken, the authority of his ancestors, or sovereignty in the modern sense. The tochi-ken is supreme, perfect, and indivisible. The exercise of this authority, however, takes a three-fold form, namely, as gyosei-ken, or the executive power, rippo-ken, or the legislative power, the shiho-ken, or the judicial power.