Karakara-sama no Himitsu

Akimitsu attended his grandfather's village, and the man was sacrificed to "Karakara-sama", the god of the water. Nevertheless it was obviously a beautiful and lovely girl that appeared. Her name was Moeki, and she or he said she needed sex like a ritual. As well as, he couldn't reject her, and the man made love with her. Next, when she returned towards the heaven, she remarked that she'd forgot to question the way to revisit. As they couldn't allow her to alone, they begun to live together. Then, their sweet life began... approximately someone thought, but there already two beautiful devil girls, Hibki and Kodama, existed in his town. Immediately, they started to attack Akimitsu.