Based off of the... third to last episode of Digimon Frontier. After Kouichi gives his spirits to Kouji and disappears, they don't really focus much on what Kouji's thinking/going through. Which is incredibly sad since DUDE, he's his BROTHER and he just DIED! Sort of. Anyway, yeah, if you can't guess whose arms those arm, well, go back and reread what I just wrote and take a wild guess.