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

premise- The great female diver who went to negotiate with the kappa is taken hostage. Ten female divers who admire her don only loincloths and confront the kappa army.
After a fierce battle, they rescue the great female diver, but one by one they fall to the kappa's magic and have their shirikodama (a mythical organ believed to be located in the anus) stolen.
What kind of ending awaits this battle between kappa and humans!?
Fighting, relatively mild ryona (sexual violence), and rape.
There are no scenes of bloodshed (on the female side) or explicit sexual acts.
It is not a bad ending.
Main story in grayscale, 36 pages (38 pages including cover),
1748 x 2480px,
version without speech bubbles also included.

1-37 text
38-75 textless