One of the most striking images from the main Sarazanmai preview trailer is of a red stain expanding outwards from an icon of an otter in a heart. The stain looks like a blood droplet spreading across Asakusa just above (or below in relation to this map, which is rotated) the Sumida River. Sarazanmai‘s Asakusa policeman duo of Reo Niiboshi and Mabu Akutsu appear to set this reaction in motion by throwing their hats in the air and yelling about extracting desire — complete with a transformation sequence that includes a lot of rising otter icons and the character “吸” for sucking or extracting. Given that the basic outline of the story involves three junior high school students transformed into kappa in search of tiny balls (shirikodama) inside the anuses of kappa zombies, Reo and Mabu’s presumed transformation where they “milk desire” is already an interesting addition.
The relationship between kappa and otters (kawauso) goes back to Japanese folklore, much like the existence of the shirikodama itself. Sarazanmai director Kunihiko Ikuhara used a kappa and otter motif around the parents of Mawaru Penguindrum‘s Ringo Oginome in a rather insidious way that could tell us a lot about his plans for a similar motif in Sarazanmai.
Major spoilers for Mawaru Penguindrum.