[AkibaSilver]

I'll back up Journey Through the Decade for being a great opening. It's very different in how melancholy and moody it is, and it fits Tsukasa's more offbeat character.

But yeah, Decade's intro wastes no time throwing you right into the thick of it, and not explaining any of it. Certainly looks cool, though! (And, of course, Gokaiger pulled the same trick in its first episode, but I'll let the net movies argue over how one stole from the other).