Um, to be completely honest, I've only just started to watch Haikyuu!!, and I'm only on episode 9 (by the time you're reading this, I'm already on a different episode >:3) Opening 1: Imagination Opening 2: Ah Yeah!! Opening 3: I'm a Believer Opening 4: Fly High Opening 5: Hikari Are Opening 6: Phoenix I can't be the only one who hears "shut up, I'm a beaver" at the end of the 3rd opening, right? XD
