A local corporation owned by the old house of Kirishima.

Kirishima Kazuki was simple, but was part of an old and respected lineage.

The memorial services for the sudden death of his older brother were to be held at the Kirishima villa in accordance with old customs.　Kazuki was sinking into depression, having already lost his parents, and now losing his older brother as well.

The days of performing the ritual to send his brother's soul at a mansion deep in the mountains begin. But those peaceful days are suddenly shattered when one day intruders appear...