Fun fact: That's actually Ryu's song, not ARth's. ARth stole almost all ''his'' songs from Ryuuuu. After aRth got exposed for stealing in 2011, Ryuuuu switched from E-Wind to NND and started uploading his songs there (he's currently inactive on NND, but still active on his new twitter)
1:37 What's the source of Iku-san saying "Thank you"? It's not in the original 2007 flash, and it does not sound like it was synthesized. Where did it come from?