Bifronte ~Kugaitou Kitan~

There is a small island called Kugaitou. Several decades ago, a man moved there and secretly formed a religious group. He was soon revered by people on the island and the group got bigger. Souichirou, the main character, was born and grew up there.... Time passes.... Souichirou is about to move to Tokyo. Just a few days before he leaves, he and his friends plan to explore an old house without knowing what will happen to them....