Ninja Girl and the Mysterious Army of Urban Legend Monsters! ~Hunt of the Headless Horseman~

In a world where monsters thrive and wraiths run wild, and ghouls and ghosts roam the streets,there exist those who hunt the creatures that do humans harm.

The setting is a Japanese cafe in the suburbs of present-day America.
Inside, there are two girls. One—Kiri Hattori—runs the store, while the other—Mary—is its poster girl.Their true identities, however, are that of a ninja descendant and a fire-hurling ghost. Together, they protect the town and hunt the Dark Beings that disturb its peace. On a certain stormy night, they offer shelter to a girl they find in front of Kiri's store.

Appearing before them at the same time is the vengeful spectre—the Headless Horseman—whose story is inextricably linked with theirs.
The two of them take in the mysterious girl, Lily, and continue on with their lives.
As they handle the day-to-day affairs of the cafe, a friendship begins to bloom between the three girls.

However, those days do not last long.

Lily wishes for a battle with Kiri.
In the midst of their fight, the Headless Horseman reappears.
What is Lily's objective?

What does their entangled fate with the Headless Horseman have in store?And finally, what awaits them at the end of the battle?