Kyosuke and his fiancée, Erisa, are visiting an isolated island in the sea and attending a mysterious festival to make a sacrifice to the island's gods. It should have been a romantic holiday, but the island seemed to be overshadowed by a great fear coming from the abyss...
Researcher Leo was told on his first day at the institute that he needed to look after some mysterious creature -- an innocent girl who fed on semen... There seemed to be more to the girl's secret than that, but no one wanted to reveal the maddening truth.