Funny story. I visited the Mosque in Yoyogi Uehara and admired it and read the writing on the wall, then realized it was in Turkish, lol.
I went inside and asked in Japanese if it was okay to look around, and the Imam said "Hos Geldin", LOOOOOOOOL
Repaired a few times, but I think it was built by Tatars long time ago. I had the pleasure of doing Friday's prayer there while visiting Japan.