I can't say I'm familiar with the game at all, but this is truly a marvelous work here.
Although it starts out in a fairly cliche fashion, once we get well into it, the highly infectious melody just takes over and is sure to be stuck in your head for hours (if you're not just playing the song on repeat anyway ).
Production-wise it's very well executed as well, and reminiscent of so many J-Pop songs I've heard recently.
One of, if not the, best pop piece on the site.