An official alternate costume for Hoshiguma Yuugi that consists of a blue kimono worn hanging off her arms, with a large red obi tied in a bow in front.
First seen in a piece of unofficial promotional art for Subterranean Animism drawn by alphes. Later appeared as a cameo background sprite in Hopeless Masquerade, before being used for her design in Touhou Gouyoku Ibun.
This tag implicates hoshiguma_yuugi (learn more).