Dystopia: Ijuu Saki wa Futei no Shima deshita

That pot was full of our essence..." ―――Naruse Souta was leading a reasonably happy life with his kind wife, Airi, and their lovely daughter, Marin. When the three of them move to a remote island for Airi's work, they are welcomed by the kind and gentle islanders. However, the true nature of the island is that it is a cult island that will do anything for the sake of its offspring...? Murder, promiscuity, obedience... On this island, where crazy ethics are the norm, a family that was close to each other begins to fall apart――…

https://www.cmoa.jp/title/260386/