In Natsuko’s past life she was an average pet dog. Living with a family in a rural village. Her owner was cheating on his wife with a woman from the next village over. He wanted to leave his wife to be with his mistress, but couldn’t bring himself to. That's when he came up with the idea to summon an inugami. Taking Natsuko out one night she brought her into the field behind their house, a ways away where his wife wouldn’t see. Buried her up to her neck and kept a bowl of food just out of reach for her.
As the days passed, Natsuko slowly starved, body growing weaker and weaker each day as she struggled to try to get out of the ground. Towards the end she began to hallucinate, visions of her reuniting with her family and living peacefully flooded her mind. When she was on the brink of dying and being released from this cruel punishment, her owner appeared. As he dug her out she trusted him enough to not run away, not to mention due to the fact that she was so weak she couldn’t if she wanted to. After gathering her out of the ground, she waited to go home, but what came next was not what she had expected. The sound of a machete slashing the air was heard. Then all she saw was red. Her owner had beheaded her.
Her owner proceeded to complete the ceremony and buried her head under the busy market street of the village, and after some time he dug it up, and brought her to the local shrine and summoned his inugami. When Natsuko was awoken, and summoned she obeyed the man without question. Her owner made Natsuko kill his wife, preparing to flee town afterwards. After Natsuko had obeyed orders, the guilt ran through to the point she felt sick. She had harmed the woman who had cared for her for many years. She wasn’t going to allow her owner to get away with this. Being fueled with rage, she turned on her master, slaughtering him in revenge before making her escape from the village that had been her home for so long. After many years of wandering she found herself in a village where there were others like her among the humans. Deciding to stay and start herself anew, she worked her way to owner of the bathhouse in the village, where she currently resides today.