The player takes on the role of Kyosuke, who took his fiancée, Erisa, to visit a lonely island in the sea. They attended a mysterious festival of the island's god, but the island seemed to be dormant with a great fear from the abyss…in an endless nightmare, the cute fiancée Erisa was abused and assaulted by others – and unspeakable things – at their will, with hardly any clothes on. “No matter how many times I have to do it, I will save you!” I believed that I would be with her all my life. That was why I would never give up so easily. And in an endless loop, I met a mysterious purple-haired girl. What secrets did this girl and this desert island hold? ◆ Game Features ◇ 24 basic CGs, including more than 300 differentials ◇ Game text: 100,000 ◇ Two main female characters and three secondary female characters ◇ A Cthulhu-style game with an infinite flow storyline ◇ Contains group sex, tentacles, and grotesque scenes ◇ Game endings: 2 types ◆Featured Systems ◇Full CG mode can be turned on in the environment setting, and HCG can be freely browsed. ◇Pressure-Free Operation Support one-click mouse operation-Fast text-to-text system