Puchimas!: Petit iDOLM@STER Episode 31: Lurking Inside
Episode 31 of 64 of Puchimas!: Petit iDOLM@STER, aired February 11, 2013, 2 minutes. Available with English subtitles and dub where released.
Episode summary
Yukiho is attacked by the contents of the mystery backpack. Source: crunchyroll