Crystal Chronicles on the GameCube. Main series wise, it was 1, the Dawn of Souls version. Ironically, I'm playing the PSP version currently.
I went on to own: III, VII, VIII, IX, X, XII, XIII, XII-2, Lighting Returns, Crisis Core, Dirge Of Cerberus, Ring of Fates, Echoes Of Time, The Crystal Bearers, Advent Children, and The Spirits Within.