[ENG SUB] Nijiyon Season 3 Episode 7 (#13 "Nana and Setsuna①" #14 "Nana and Setsuna②") 

https://en.wikipedia.org/wiki/Zashiki-warashi

Correction: 0:32 “It must have been about one of Setsuna’s favorite units.”

Original: https://www.youtube.com/watch?v=eVBfFaZgEtQ