In 1941, slightly before the Japanese offensive on Pearl Harbor, the Japanese government froze the assets of all Americans on Japanese soil, absorbed businesses owned by foreigners, and forbid them from withdrawing money from banks. Faced with economic ruin, the majority of Americans left. Of those that remained, the males over 18 were labeled "Enemy Aliens" and sent to "Enemy Alien Holding Camps". In 1942, the definition of Enemy Alien was enlarged to include women and elders who were teachers, nuns, missionaries, and kindergarten teachers. In 1943, the definition was once again enlarged to include even the jobless elderly, housewives, and children.

At the holding camp in Uchiyama, where men were held, 6 out of 53 inmates died.

Source: 太平洋戦争と横浜の外国人　—敵産管理と敵国人抑留— by 小宮　まゆみ

Anything close to what the US did to the Japanese here?

Do you mean Japanese-Americans? There's no equivalent because there's no large population of white Americans that naturalized to Japanese citizenship. Most of the WWII combatants expelled or interned citizens of enemy countries, the issue with the Japanese-Americans was that they were U.S. citizens but still interned.

There were Japanese-Americans who were in Japan when the war started, visiting family and such. Most renounced their U.S. citizenship, probably under social pressure, a few did not, notably "Tokyo Rose" Iva Toguri.