User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-8874090-20131006161601/@comment-3277384-20131006174053

A new hunter is brought to Barubare by the Village Chief. He starts to help the village. For some reason (Goa magara comes to barubare region if I'm right), the main NPCs begin a journey on caravans. The hunter follows them. They reach Naguri. The naguri's people is in difficulty because their work and life depends by the volcano (?) which is asleep. The hunter, somehow, helps Naguri and when the lava flows again, the caravans companions take the seaship blocked on the wall of the village. They begin a journey on the sea where they encounter Goa Magara. Another ship with the legendary hunters help them to reach Chico Village. Here the hunter helps the heroes (?). Some heroes and the hunter encounter Goa Magara in unknown sea of trees. The hunter must defeat it, and so it does. They now reach Shinato village (I don't know why and how). Here the hunter discovers the infected monsters. A goa magara turns into Shaguru. The fauna in Shinato region is unstable. The hunter save the village defeating Shaguru.

This is what I understood from the videos :P