YTP - ⑨ This YouTube Poop has posted on that Holiday. Cirno Day is Cirno's Holiday. Cirno Day is on September 9. Ways to Celebrate Cirno Day Post a YouTube Poop about Cirno on that day. Say "9"! Say "Cirno is awesome!" Retrieved from "https://king-harkinian.fandom.com/wiki/Cirno_Day?oldid=14813" Categories: Holidays Touhou Community content is available under CC-BY-SA unless otherwise noted.