where to add Japanese title?

Japanese titles are often very different from the English title. I tried to add 女神の継承 as the Japanese title for https://www.imdb.com/title/tt13446168/?ref_=nm_flmg_wr_1 but it was rejected in Keywords because only roman letters are allowed. 

How can I add Japanese titles? Where do they belong? Or IMDB doesn't want this information on their listings?