Doujin games and anime aren’t so far apart that we can apply the statement that ne’er the twain shall meet because the two fanbases do overlap. However, they are far apart enough that you rarely see anyone combining music from games and anime into a fan-made arrangement. After all, much of the doujin music that comes out of Comiket are decidedly non-anime in nature. Ditto with Reitaisai for obvious reasons.
So when I come across a track that combines both, it’s always cause for rejoicing and kaztora’s “チルノの動く城” is one that fits the bill. As you listen to this, you may find yourself surprised to find two familiar themes milling about (moreso if you can’t figure out the translation for the track title!):