Ninja Nonsense Episode 5: Onsokumaru Goes to Hell / The Ninjas Host a Summer Festival
Episode 5 of 12 of Ninja Nonsense, aired August 5, 2004, 24 minutes. Available with English subtitles and dub where released.
Episode summary
Onsokumaru is sent to Hell and encounters demon schoolgirls, demon wives, and demon in-laws; when it's too hot to train, the ninjas plan a Summer Festival to brighten the mood.