As you already know that SEGA has only localized one of the four released 7th Dragon games from Japan. That one was the last one 7th Dragon III Code: VFD on the Nintendo 3DS. But if you didn’t already know the game debuted back in 2009 on the Nintendo DS with 7th Dragon (translated here), then 7th Dragon 2020 (translated here) on PSP and then comes this newly translated title 7th Dragon 2020-II. Obviously 7th Dragon 2020-II is a direct sequel the previous PSP game and its recommended you play that first.
If you guys didn’t know 7th Dragon was requested by most hardcore SEGA fans due to the involvement of big named SEGA creators including producer Rieko Kodama (Phantasy Star, Skies of Arcadia) and composer Yuzo Koshiro (Streets of Rage, Etrian Odyssey). I love these sort of fan translation projects because lets be honest, there is no way that these past three 7th Dragon games will get localization in the west especially considering that the Nintendo DS and PSP are both obsolete.