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Ohh... wow... well, in that case, I have never, ever seen a Kubara Wood drop offline. XD

Gosh, I can't remember the name of it. You enter the Linear Line Platform through the PPT Spaceport, and it's the first C-Rank mission available to you (Creatures are Level 1+). No prerequisites....

I've seen quite a few Kubara Woods in the Linear Line missions. That may, however, just be a hit of luck.