Tenkuu Senki Shurato: Sousei e no Antou
Japanese title: 天空戦記シュラト　創世への暗闘
Type: OVA
Episodes: 6
Source: Unknown
Genres: Action, Fantasy
Studios: Tatsunoko Production
Duration: 30 min per ep
Rating: PG-13 - Teens 13 or older

This is the continuation of the TV series. The battle for the celestial sphere is over. Gai and Shurato have been erased from history. However, another danger is coming ahead, and the eight guardians are sent back to Earth to investigate. As Shurato tries to win back his friends in a world that has forgotten him, a new villain has a mysterious plan for them.

(Source: AnimeDB)