there are many really so its difficult to choose.....
may be to choose 1 (or infact 2)
1. this game 2.zero
both are from the same 아니메 "no game no life"
ive not yet watched this series yet but i already 사랑 both the songs ( i dont really listen to songs from 아니메 ive never watched before, but somehow i came across "this game")