Japan Animator Expo (2014) : 3x3

Bubu & Bubulina are two sisters who are drawn into a story about a sad ghost. Babu is the younger sister, and can shoot objects from a horn she carries, while Babulina is the older but more cynical one. One day, they encounter a dancing blonde haired girl gloating about how well she can dance thanks to a pair of red shoes she has on. Babulina is unimpressed with the girl, but the shoes catch her eyes so the blonde girl offers them to her to which she accepts. The blonde girl tricks her though, and runs off while a ghost possess Babulina's body. The ghost introduces herself as Audrey, and tells Babu that she was going to dance at this show. She says though that she had died before she could have the chance to perform, and hear the audience cheer for her. Babu initially feels sad, but has an idea. With her horn she shoots out an audience that claps for Audrey which cheers her up enough to keep dancing.