Futanari Mermaids

In The Rescue of Mermaids, you play Garry, a rare human-looking creature who can become into octopus when aroused (eromorph). Garry has three mermaid companions accompanying him on his journey to find a new planet to call home, but when they finally find an ideal planet, the mermaids end up being kidnapped. Now he needs to figure out how to rescue them and ensure peace and security for his lineage.

The remote island of Kameshima sits nestled in Ise bay.
Yuza Minakuchi is a young pearl diver who lives on the island and spends his days underwater gathering, together with his best friend Azami Kumoi. After he has a bewildering supernatural experience encountering another version of himself on the ocean floor, a series of curses start to befall the island...
A girl of unknown origins, a treasure hunter from a foreign land and a mysterious housewife investigating a drowning. Paths cross and destinies collide as they come closer to the secret of the Mermaids of Ise, a legend that has been obscured by the fog of history for so long.

Demons have been resurrected after a thousand years of sealing. There are over 10,000 of them.
The demons head for an island where beautiful mermaids live…
There lives a mother mermaid and her three daughters.
Mermaids are prey. Prey for the demons to indulge in their desires.
Mermaids are fish from the waist down.
Humans call them mermaids.
However, mermaids have a slit between their legs, and the organs that function as genitals remain.
They are well-built, with full breasts, curvaceous waists, and big butts.
It is their beauty that attracts the demons.
The demons thoroughly devour the slits of their private parts.
It doesn’t matter if they can’t spread their legs. Even though her crotch is closed, the devil forcefully rapes the mermaid!
The mermaid’s pussy, deep inside her closed crotch, is now opened for the first time!
The devil first attacks the mother… Then he attacks the fleeing daughters one by one.
The mermaids are unable to escape in the sea, which is protected by a barrier, and are quickly cornered…
The devil beats the daughter in front of her mother, who begs for help, and then finds her crack and hard-rapes her!!
The devil continues to thrust into her, even as she cries out “Mommy! Mommy!” Gangbang and creampie! Repeated egg-laying!!
The never-ending story of a mermaid whose screams echo throughout the island.

It's a time when a faster-than-light substance has been discovered and humanity has migrated to Mars.
Suddenly, one day, an organisation lost contact with the centre.
They also found many unidentified life forms and tentacles wandering around the roadside.
Newcomer "Sasha" is a member of the Masta Zones (like a cosmic police force).
With the help of "Nabiko", she goes alone to the organisation to investigate...

No one ever explained to the woman why the acolytes of the holy temple of the Goddess needed to be virgins. Even though the temple was run only by women, all new acolytes had to be pure and virginal – and the reason would soon be revealed in this acolyte’s first ceremony!