Shoujo Shuryou no Suiri Ryouiki: Kogane Shima no Mitsuyaku

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On an island ruled by the mafia, a young girl's quest starts...

This story takes place in 2002 on a group of islands named Gueml in the Atlantic Ocean. Our main character has decided to find out the truth behind the previous mafia boss' - her father's - murder. The islands of Gueml are divided into four parts which are all dominated by the mafia, so in order to get any leads, she needs to talk to the boss of each and every area and make deals. In order to find out the truth, and maybe even find out more about the islands where she lives, the main character has to go through various sacrifices and has to make deals of all kinds. However, the ending is completely dependent on whatever choice you make.

Source: IGDB