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.

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.

Life for the Midou family returns to normal. Ryuuhei welcomes friends and family to celebrate, but plans go astray as the full moon feast begins. Kouhei might have to save the day one last time.

In this zany spoof, the Midou house has been relocated to the middle of the ocean. While no one but Seiji seems to notice anything wrong with this, the rest go along with their off beat day.