In story,
After Karasu MK-II destructed and drown by O.M.N.I. best pilots coalition, Budz need long times to bring back Karasu to life. Budz and his team pull up again the MS Cargo where he find Karasu for the first time, to search data about Karasu. finally he find the bluescript and development data of Karasu and it's unstable dark particle. He re-analyze and learn everything from that bluescript for weeks to resurrect his best friend, "Karasu".
After long time of analyze and trial, finally budz can find out what is dark particle truth. first thing he do is repairing the Karasu original dark particle generator and also make a new generator for alternative when the original generator being broken down again. after that, he build again the Karasu in a new inner frame structure. Budz also make new armaments for his beloved Mobile Suit.
And here we go... The Ultimate Karasu
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Uploaded 01 March 2016