This ground "The bad morale one" Kusuzuki Shinto shrine built to seal it. The actual head of a family of that company is from generation to generation, you are obliged served to protect the people who live in the land. However there are no perfect seals. Little by little, the miasma begins to overflow. The actual head of a family from age to age that miasma, it carrys it on my back with one's body, it made it to nothing. Sometime such, the predecessors in the family line present head of a household dies. Yahiro that succeeds, it is young and cannot yet perform succession ceremony... therefore the ground is filled with the miasmas, it undermines the earth and begins to erode.

After that years have passed. it becomes a age that Yahiro can hold a ceremony of the succession, it takes over the company as family head. And the miasmas that overflowed gather in nature and Yahiro, it begins to erode him. There are neither a resolution nor knowledge, actual head of a family's true role is unknown not yet.

And it is several months later, Yahiro is called by grandmother and learns the truth. Seal it, it is the miasma that he attracts, it is an accident to fall on own. And ceremony that spoils it. [Now. Please... Actual head of a family-sama. Here] That is "Act to have sex with Shrine maidens". In a word elder sister Maina and younger sister Suzu the body was piled up.