Conquer Four Heroines to Rise

Cole worked as a deckhand on a yacht and was treated badly by the people aboard. The yacht went down and he washed up on an empty island. Nobody came for him. There he unlocked a conquest system, and with it he stopped being someone who could be pushed around. Grace, Charlotte, Olivia and Zoe had been stranded there too, and he won them over one by one. Pirates came and he fought them. Blackstone was running experiments on people on the island, and he went through those. Then he found out the shipwreck had been arranged, and he turned on the man behind it and made for a way off the island with the women who had joined him.