10,000 years in the future, the world has become a very different place; monsters roam the land freely, and people, although equipped with high tech weapons and cybernetic horses, live a humble life more suited to centuries past. The story focuses on a small hamlet plagued by monster attacks and living under the shadow of rule by Count Magnus Lee, a powerful vampire lord who has ruled the land for thousands of years. When a young girl is bitten by the Count and chosen as his current plaything, she seeks out help of a quiet wandering stranger, D. It so happens that D is one of the world's best vampire hunters, and he takes it upon himself to cut through Magnus Lee's many minions, and put an end to the Count's rule.

There are some things that people are unable to say while they are alive; for these, there are "shigofumi," letters carried from the world of the dead to the world of the living. When a person with strong emotions dies, they are able to create a shigofumi, whether their feelings are of love, longing, or resentment. It is the quiet and mysterious Fumika's job to deliver these messages from the departed. Along with her talking magic staff Kanaka, she ensures that each shigofumi reaches its intended recipient, even if that person does not want to face its contents. Fumika witnesses the tragedies of people, both dead and alive, and sees their deepest secrets revealed. What is unclear, however, are the details of Fumika's past. Who was she before she came to be a carrier of shigofumi?

Ohana Matsumae has been working at Kissui Inn as a waitress for a while now. However, she realizes that she is starting to lose her desire to sparkle, having grown accustomed to the routines of her job. As this was a desire she had when she first moved to the inn, the realization bothers her. While having Yuina Wakura—Ohana's classmate, friend, and the daughter of rival Fukuya Inn's owner—under her as an apprentice, Ohana stumbles upon some old archives that mention her mother, Satsuki. Ohana does not know much about her mother, but these archives could shed some light on her past.

Besides learning more about her mother, it is business as usual at Kissui Inn—though with a couple of challenges to test Ohana and the staff of the inn.

[Written by MAL Rewrite]

Low on luck after a series of unfortunate events, You Keika works part-time to try bringing himself out of a life of poverty. After a strange encounter with a white-haired man in a junkyard, You wakes up to discover that he was killed in a sudden accident and has become a spirit. The man he had encountered, Tanmoku Ki, is revealed as the 13th Youmeshi of the Tanmoki, the highest-ranking exorcist family of China. Noticing the wandering spirit, he offers You the opportunity to form a pact: he will offer You protection from humans and in return, You will have to become his spirit shadow, keeping him safe and guarded at all times. From then on, the two face untold challenges in the spiritual world, striving to keep those around them safe from harmful spirits. Along the way, the pact they formed grows into something more; a bond that neither of the two ever expected. Behind their roles as master and servant, a lingering admiration begins to emerge. [Written by MAL Rewrite]