Planetes Episode 6: The Lunar Flying Squirrels
Episode 6 of 26 of Planetes, aired November 8, 2003, 25 minutes. Available with English subtitles and dub where released.
Episode summary
On Hachimaki and Tanabe's visit to the Moon, they meet Tanabe's neighbours... a group of wannabe ninjas who perform ninja techniques through the Moon's lower gravity.