Kaizoku Ouhime Alfiana ~Inda to Shokushu no Yuureisen~

The princess Alfiana Shatazelc once abandoned her status of royalty to become a pirate.
Steering the light, swift vessel, “Artemia”,
She navigates the great wide ocean freely, looting anywhere she pleases.

Then, the huge phantom ship of legendary sea pirate “Boneguard” appears before her.
Alfiana and her friends board the huge ghost ship in search of the treasure that is stored in the ship’s hold, however…
… Lying in wait for them is the ship’s crew, those who continue to live on as skeletons, and the still animated dead bodies of drowned sailors.
Defeated by the immortal and invulnerable phantoms, Alfiana dives into the ship’s hatch and is commanded to search for the lost sword “Aiken”, on the conditions of a one-on-one duel with the ghost ship’s captain.
However, the ship’s hold is the haunt of more of the ship’s starved ghosts, as well as a number of other unidentified tentacle monsters!!

[From dlsite]