((Several years ago, the vampire slayer at Aibishi High School almost defeated the vampires, but the vampires escaped.The goal of the vampires is to build a castle.))

The main character is you, this year you enter Aibishi High School across the highway, half a kilometer from your house.

Semester 1 is over, and you got 11th place out of 32 people in your class. When you start the 4th day of the 2nd semester, suddenly all the windows of your school break, and vampires invade your school.