If you are unable to input Japanese normally into KDE applications, you can use Kiten's Kana input system that is built in to the text-entry.
To start Kana input, press Shift+Space. Now inputted syllables will be transformed into Hiragana. If you type a syllable in capital letters, it will be transformed into Katakana instead. Press Shift+Space again to go back to regular input.
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