boiled-mozc.el wraps("boil"s) mozc.el to offer modeless input style,
where you can type a Romaji sequence without activating the Mozc input
method and then just hit \M-o or \C-o to obtain its Hiragana and
Kana-Kanji conversion, respectively.

To use `boiled-mozc.el`, just add the following code into your `.emacs`:

    (autoload 'boiled-mozc-rK-conv "boiled-mozc"
      "Romaji to Kana-Kanji conversion" t)
    (autoload 'boiled-mozc-rhkR-conv "boiled-mozc"
      "Romaji to Hiragana conversion" t)
    (global-set-key "\C-o" 'boiled-mozc-rK-conv)
    (global-set-key "\M-o" 'boiled-mozc-rhkR-conv)

WWW: https://github.com/tadanagao/boiled-mozc