source- https://www.dlsite.com/maniax/circle/profile/=/maker_id/RG14831.html
Artist- https://www.pixiv.net/en/users/29088547/artworks

premise- A shadow suddenly attacks a young female diver working at sea—its true identity is a female kappa who desires human shirikodama (a mythical organ believed to be located in the anus)!
After winning a one-on-one duel, the female kappa caresses the diver's body to refine a high-quality shirikodama... A
serious battle between the female kappa and the diver!
Fighting and relatively mild (no bleeding) ryona
Contains depictions of petting between women.
22 pages including cover (21 pages of main story)
Grayscale
Includes textless version

1-22 text
23-44 textless