Relations between Iran and the East Asia date back to ancient times. These interactions ranged in function and scale from the initial development of overland trade routes by hopeful merchants, all the way to the political entanglements of ruling dynasties. These relations can be traced through material culture but also through their incorporation into written texts. Although, China (Čīn) and Korea (Silla) had been referenced in relation to the Zoroastrian heroes of the resurrection, Japan did not have any position in this regard according to Persian texts. Additionally, the name China was known for the Middle Persian languages such as Sogdian, Manichean and Zoroastrian Pahlavi texts, those texts have never mentioned the name of Japan. Although, many scholarly works have been published on Iran-Japan historical relations, the author believes that some aspects of these relations need to be reviewed. Zoroastrian late texts describe Čīnestān while it is hard to explain the term included Japan and Silla, but this information can be seen frequently in the Early Islamic Periods widely about Silla. According to the Persian texts, Čīn and Silla were two “holy toponyms” where the final (Zoroastrian) savior would come to rescue Iran from the Arabs. Surprisingly heroes-kings like Jamshid, Faridun, Faranak, Zahhak, Garshasb, Sām were entangled with these two toponyms according to Persian texts. Clearly Japan appeared less frequently as a toponym in Persian classic texts. The author believes that believe “refraining to give support to Sasanian princes” should serve as a significant factor in dropping Japan’s name by Persian texts. In this article I will try to answer “why references to Japan are lacking in Persian classic texts?”