7/21/13 Edit: Decklists are now up.
Tournament sponsor Hiwa Nyan has sent word out on Twitter that the first Chiba VGCS was won by a Spike Brothers cardfighter, speculated to be using the same Dudley Emperor-Bad End Dragger build that has been doing so well in the current Fighter's Road 2013 national tournament. Second place reportedly went to a Narukami cardfighter using an Eradicator deck, and while the exact build is unknown, the general assumption is that it will be another Dragonic Descendant variant. According to the Chiba VGCS' official Twitter, the decklists will be out tomorrow at the earliest, so the nature of these two decks cannot be set in stone until that time.
The VGCS tournaments are a series of unofficial tournaments organized by fans and cardshops. Unlike Bushiroad's larger official tournaments, most VGCS events are done using a best of 3, Swiss tournament model, with entry fees in the vicinity of 1000 yen per person that go toward grand prizes like booster boxes, Nintendo 3DS handhelds and other merchandise. Turnout is typically 70-80 persons, but some events see 100 or more participants, all of whom compete using pseudonyms and internet handles rather than their real names as in official events. The Chiba VGCS had a capacity of up to 96 persons but the actual turnout is not yet known.