What is the Anime located that has two groups of students at a school, one above ground and the other hiding below, fighting each other. Most of the action happens above ground at night. And some of the students have powers. Some could be vampires.

I need help locating an Anime located at a school, with two groups of students fighting each other, one above ground and the other hiding underground.

Most of the action seems to happen at night aboveground. And some of the students have powers.

I also seem to remember that at least some of the students above ground were vampires, but I could be mistaken.

If anda have any ideas, please suggest away!