今日はレオンさん,
I don't know if this will be of immediate help, but you might have to type Japanese characters in an Input Method Editor (IME) to have it automatically replaced by kana or kanji characters. One such IME is provided by default in Windows.
For background info, this
Wikipedia article might be of help.
For setting up the IME in Windows and learning how to type in Japanese, see
this link. That way, you won't have to set your OS regional settings to Japanese to write that exquisite, if very slightly complicated language
.
頑張って下さい!
Cheers,
Fabien