An after-... image...?
Artist's commentary
Touhou 4-Panel Strips #1836 Out with the Bad Luck!
.... It's an after-image.
[Survey: Do you believe in ehoumaki?]
• Yes, I do
• I do, but I'm not good with them, so I don't eat them
• No, I don't
• I don't, but they're delicious, so I eat them