Hime Chen! Otogi Chikku Idol Lilpri S01E31 - I Spy a Tiny Witch! Pri!

On their way home from school, the girls run into their classmate Natsume Mahiru and her little sister Manatsu. At close glance, Manatsu looks kinda like a witch. It turns out, they are going to be participating in the costume festival. Everyone dresses up how they want and parades through the Hanasaki District. Of course, Manatsu is going as a witch. Mahiru is going dressed as her favorite, a vampire. Hearing this, Ringo and the others decide to join in since it sounds fun. However, Mahiru is not very good at making costumes. Ringo proposes that they all make the costumes together while learning from Leila, who is good at sewing. They all gather at Leila's house and get to work making costumes.