One of the classics of Japanese folklore is Jiraiya Gōketsu Monogatari, the tale of a gallant shape-shifting ninja who can become a giant toad or summon a different giant toad to ride. The work has been adapted into a series of 19th century novels, a kabuki drama, numerous prints and paintings, several films and a manga series—it is clearly a staple of Japanese culture (even if the fundamental conceit sounds a trifle peculiar to western ears).
As awesome as a ninja who becomes a toad or rides a toad sounds, it is not what concerns us here. Instead this post is dedicated to the wife of the protagonist, the beautiful maiden Tsunade (綱手) who is a master of slug magic! She was able to summon a giant slug or become a slug.
I wish I could explain this better but I haven’t (yet) read Jiraiya Gōketsu Monogatari. Perhaps these woodblock and manga images from various incarnations of the work will speak for themselve. At the top of this entry is a picture of the ninja with toad magic (right) along with his wife the slug magician (left), but the rest of the prints and cartoons are pictures of Tsunade. Based on the contemporary cartoon here below, and on some of the Edo-era prints, it seems like there may be an erotic component to this tale of heroic magical slugs and toads.
If western mythmakers and storytellers could think like this, maybe sitcoms would not be so agonizing. This is some weird and lovely stuff. We have made next to no headway understanding Japanese culture, but we have certainly looked at some weird slug girl art!