WARNING: This article contains spoilers, please read at your own risk!
In Touhou Project 10.5: Scarlet Weather Rhapsody, Sakuya was initially commanded by Remilia Scarlet to find all possible suspects behind the strange weather. When Remilia grew tired of “questioning”, she then ordered Sakuya to personally find and deal with the culprit. After doing so, she told Reimu where to find the culprit and helped rebuild the Hakurei Shrine after it was destroyed for the second time.
That’s an interesting outfit for Sakuya. I wonder if this an official costume or a fan-made one? Thanks again to 4chanatic for sending this in!