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GosickThemeSkin v1.5 (2014/2/22)

Check out my guide!

This skin was made by Archeryi. I'm merely re-uploading this because the original skin thread on the osu! forums has been long-removed and the original download link by the creator has long since expired, and the creator is no longer active in osu! to ask them to re-upload and update it.

I made my own updated mashup skin here if you're interested in a more "modernized version".

This skin doesn't work 100% flawlessly.
There are plenty of issues with it, as it was made for a resolution of 1280x960 according to the original creator. One of the biggest issues is the spinner middle circle isn't properly centered, many images (pause, fail, ranking) don't properly scale, etc.