Kappa to Shirikodama – Kappa and the Small Anus Ball | 百物語怪談会 Hyakumonogatari Kaidankai
Spoon & Tamago - Did you know that in Japanese folklore people had a magical ball in their butt called shirikodama? And for some reason kappa wanted them. So artists imagined different
Shirikodama | Sarazanmai Wiki | Fandom
The Kappa Water Demon
Bite-Sized Bestiary - kappa: Shirikodama (check for more in the comments) : r/mythology