Seeking to understand why he couldn't capture a hauntingly beautiful young girl on film, Kouhei Morioka stumbles into a medieval castle and a world he cannot comprehend.

In order to free Hazuki, Kouhei sets out to destroy the crystal orb - the source of the castle guardian's power. Meanwhile, Seiji joins the battle from outside the barrier.

Kouhei and Hazuki seek out the young vampire's childhood home, so that she may fulfill her last promise to her mother - the same mother who abandoned her two years past.

The return of the full moon has stirred Hazuki's thirst for blood. When Kouhei won't give her what she wants, the little vamp sets out on the hunt.