【Mayofun】Parasitic sea cucumbers vs. divers

A female diver who is responsible for fighting off demons that come from the sea.

This is the story of two divers who went to check out a mysterious sea cucumber and never returned.
When the rest of the group rushes to support them, the first two have had their bodies taken over by demons!

They are forced to fight the possessed friends, but

A battle of flesh and blood between divers

Fighting – relatively mild (no bleeding) Lyona
Catfight

23 pages including the cover (22 pages of the main story)
Grayscale

This book is also available without text.