Want IME Japanese input on Jelly Bean Rom

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http://forum.xda-developers.com – I live in Japan and own a Samsung Galaxy Nexus. I'm running on the Docomo network. I've rooted my phone. I have Android 4.0.4. I started to check out the different ROMS and decided to use the Jelly Bean ROM I found on galaxynexusroot.com called: aokp-jelly-bean-rom-build-1-for-galaxy-nexus-gsmverizonsprint 2 problems so far, the first and main problem for me is that there is no longer a choice to use the IME Japanese keyboard that came with my GNEx. I need this keyboard because I have email in Japanese. I've seen some apps, but the inability to change to kanji characters makes t (HowTos)