Hey, i dont know how to pm ( i literally made this account yesterday for boot9strap release) and I installed boot9strap when the guide updated, so here is my proof
@Xdqwerty, Osu! Tatakae! Ouendan! is the Japanese version of the game, different settings/characters/songs but otherwise identical mechanics. I played that before I knew about Elite Beat Agents lol. Both fantastic games https://en.wikipedia.org/wiki/Osu!_Tatakae!_Ouendan