MoF Nitori's Theme: Candid Friend
youtu.be
This is Nitori Kawashiro's theme from Touhou 10: Mountain of FaithI love this theme. In the beginning, you see a shy, but energetic kappa, and as it progress...

One of the best Touhou pieces according to my taste. Looped this masterpiece once for 36 hours.

There are other pretty Touhou soundtracks, though.