Short answers, pulled from the story.
Final Fantasy: Legend of the Crystals is a four-episode anime OVA produced by NTT Publishing with animation by Madhouse. It was first released in Japan on VHS between March and July 1994, with a North American English dubbed version arriving across two volumes in December 1997 and February 1998.
Yes. Legend of the Crystals is set on Planet R, two hundred years after the events of Final Fantasy V, making it the first direct sequel ever produced for a Final Fantasy game. It is also the first animated media created for the Final Fantasy series.
The main characters are Prettz, a reckless young swordsman who rides a motorcycle and uses a nodachi and spiked bombs, and Linally, a novice summoner and descendant of Final Fantasy V's hero Bartz. Supporting characters include Mid, the ghost of Cid's grandson, sky pirate Rouge, and Valkus, a general loyal to Queen Lenna.
Masahiko Sato composed the original score. It includes multiple musical cues from Nobuo Uematsu's Final Fantasy V soundtrack, among them the game's opening theme and the Chocobo theme. Two soundtrack volumes were released in 1994, the first on the 21st of May and the second on the 21st of July.
No. Urban Vision, which distributed the North American VHS release, has since lost the distribution license. The series has not been released in any other format, including Blu-ray, following its original VHS releases in 1997 and 1998.
Reception has been divided across eras. In the late 1990s, reviewers at GameFan and EX praised it warmly, with GameFan awarding it an A rating above episodes of Neon Genesis Evangelion. Later retrospective critics from outlets including IGN, Kotaku, and THEM Anime Reviews were sharply negative, with THEM Anime Reviews giving it 1 out of 5 stars and IGN noting it did not become a favourite part of the Final Fantasy legacy.