Digimon Rury[sic] is a bootleg RPG for the GBA. It's weird, with laughably poorly translated English texts, and it just sucks.
It's intro theme of the game is stolen from Brave Heart, a song from the Japanese version of Digimon: Digital Monsters. The game plays this theme too fast, as it is played in 22 kHz, though the sample was clearly intended to be played in 11 kHz. So I played it in 11 kHz in Audacity and rendered the result for here.
PS: I don't know or care about Digimon.