the great thing about touhou is that every 3 months or so zun will put out some random new bit of Canon Content that takes a minor character you've never seen and goes "oh yeah uhhh you know that girl seiga? showed up in one game and isn't real important? uhhhh she stole christmas once. no like she went around and stole everyone's gifts on christmas. because she's a dick. yeah that's canon actually"
this is from the in universe tabloid that zun made
she actually does this she sells pillows and then uses her dream powers to visit people at night and ask them what they thought of the pillow
a group did a full animated fansong about it that looks like a Japanese 2 am infomercial https://www.youtube.com/watch?v=UlV3VKnXDFM
