^^
I agree with you. The song just "fits" but I think that's what they're going for. If the anniversary song was something as flashy and hardcore like DISPLAY, Pick Me Up, Party Maker, FAKE IT, etc., it wouldn't be as...special IMO. It gives me that nostalgic, home-y feel and I like it!
Also STAR TRAIN MV teaser:
It really gives me a foreboding feeling. This video is probably going to make me cry