A 4 part OVA released with the limited editions of the Tsubasa and xxxHOLiC volumes.
There are two OVAs for each series, with plots linked together.
They cover the Nihon Country Arc and scarcely some of the Celes Country Arc.
English: Tsubasa RESERVoir CHRoNiCLE: Spring Thunder Chronicle
Synonyms: Tsubasa Reservoir Chronicle OVA, Tsubasa Reservoir Chronicle: Spring Thunder
Japanese: ツバサ 春雷記
Status: Finished Airing
Aired: Mar 17, 2009 to May 15, 2009
Season: Spring 2009
Studio: Production I.G
Duration: 29 minutes
External Links: MyAnimeList