This paper analyzes the illusion of national origin to know how Japan, a member of the East-Asian culture, secures its existence by excluding China. In modern Japan, the illusion of origin is derived from two kinds of national history annotations. The former appeared in the age of Tokugawa bakufu, in which a Japanese scholar named Motoori Norinaga suggested a conception that all myths are history. This conception is the basis of national origin on the modernization of Meiji Restoration. The latter showed up during the Taisho period. A scholar named Tsuda Sokichi, who learned the Western historical approaches claimed an opposite idea. After WWII, Tsuda's historical idea became the most important base of national origin in the wave of anti-royal thoughts. Between the two opposing historical annotation of Mikado, would we find the same Japanese? Would the Japan build up ”the self” by taking China as ”the other”?