From Mad Hatter Scans:
In the peaceful period of the early Edo period, people lived in fear of Shadow Beasts that consumed the heart of the people. Exorcists and hunters use their abilities to rid of the beasts, and when a young exorcist named Hibana, puts herself in a reckless battle against the Shadow Beasts, she is rescued by lone Hunter, Tsugumi, causing the beginning of a romantic adventure.
From Intercross:
During the early Edo era, there was a mononoke called "Shadow Beast" that disturbed the peaceful world. This powerful beast is being hunted to be exorcised one day meets Kuromon Shigumi, a powerful hunter on par with the mononoke. What will happen in this supernatural story?!
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