This isn't based on any vocaloid song. It is a cover of Cirno's theme "Beloved Tomboyish Daughter" from the game Embodiment of the Scarlet Devil. Like many Touhou remixes, it uses the original motif in a small part of the song, the rest of it being entirely original material. The only similarity this song has to Popipo is the fact that both are advertising fake drinks.
I really appreciate Locker Room Productions, they do some really nice animations for the Touhou series. *Applauds.* ...That, and they animated on of Albatrosicks's songs, Hoshi Wo Koete I think it was. 83
She may be the strongest, but that doesn't always mean she's the smartest. However, she's a good singer, teacher, and now a salesfairy. She's on a roll!
@AstroCaratHelper The story goes like this: ZUN, the creator of these games, had a picture in the manual of Touhou 9 (Phantasmagoria of Flower View) where he described the different objects on the screen, with (1) - Player Character, (2) - lives and so on. And then he got to (9), which was on Cirno. However, instead of Opponent or Cirno, he wrote Baka. And from then on, Cirno has been known as Circle Nine, the Baka. I hope that helps.
@chelseafcrocks82 If you've played her game, you know that's not exactly the case. (she declares war, then forgets about it, then months later remembers it.) however she is relatively strong. She's the strongest fairy at least.
@Zedd0000 @PrincesZeldaTwilight You mean Kasane Territory sounds like this song. Kasane Territory is based on Zutto Cirno no Turn, which is based on Beloved Tomboyish Girl. Chirumiru is also based on Beloved Tomboyish Girl
I'll "pass forward" what was shared with me. The reference at 1:13 is to the game manual, which numbers parts of the game screen, she is in the image and is number 9 which was labelled Baka (idiot.) This is why the 9 in a circle has become a fan shorthand for referring to Cirno.