iOS 8 broke my Japanese keyboard. (iPhone 5s)

Hello folks,

I am a native English speaker living and working in Japan and I require my iPhone's Japanese keyboard for everyday life. Please help!

The problem:

I updated to iOS 8 (from 7.0.4, iPhone 5s 32 GB) without issue last night before going to sleep. This morning I realised that I could not use the Japanese keyboard.

-Word prediction & autocorrect both work fine when I start with the English keyboard.

-I had not installed any new keyboards before the problem began.

-When I switch from English to Japanese keyboards, Japanese characters do not appear when typing, only roman letters.

-This only occurs with the "romaji" keyboard. The kana keyboard works but I've never used it before so it's kind of a pain.

-The prediction line disappears andautocorrect stops working.

-Can only get them back by closing & restarting the app.

-I've tested several different apps, iMessage, Line, two different Japanese dictionaries, Spotlight, Pages, etc., all with the same problem.

-I have since downloaded two other keyboards, MyScript - Stack & SwiftKey, Stack works but SwiftKey doesn't have a Japanese language pack.

Attempts to fix:

-Restarted -> Didn't work.

-Deleted all keyboards, restarted & re-added. -> Didn't work.

-Added 3rd party keyboards. -> Didn't work.

-Added Chinese keyboards. -> Chinese works, but I don't need it. I need Japanese.

-Added & removed several other keyboards in different combinations. -> Didn't work.

After writing all this down I'm pretty sure the only solution may be to restore, but if anyone has any tricks I would be grateful! I haven't found anything on the web about this so maybe I'm a unique butterfly.

Thanks for reading!

-The guy who just got a mosquito bite on his hand.

😠