A beast sent by the great fox god. Her job was to assassinate youkai who opposed the myriad gods. Sachi was granted the unique charm technique to convert youkai energy into spiritual energy by the great fox god, and both the Tenrouin family, that led the secret worshippers, and the Kagurazaki family, that used lesser yin-yang, mixed in the charm technique that was passed through the generations, and a unique charm technique was created. From it, "Great Charm Technique: Spirit Charming Bishamon Killer" was passed down by the Tenrouin family, and "Great Charm Technique: Spirit Charming Izunadaigogen" by the Kagurazaki family. Afterwards, her deeds were recognized, and she was granted the name of "Heavenly Brilliant Light" and a shrine, and was relieved of her duty. She doesn't have the red eyes characteristic of a youkai, but instead has blue pure eyes, which is uncommon. As she aged, she became a kuuko, and those pure eyes became clairvoyant, but in exchange for having the power to see all across Japan, her physical strength became extremely poor. The Tenrouin family is influential in the secret world, and up until Sachi became a kuuko, she borrowed and used their name. Not too sure about the yin yang part.