Demon Trouble, Too

Alana Fainot is a demon gate guardian, stuck in her last boring
year of school. But not for long. Hunter and the rest of the gang show up when
her astral form can't return to her physical form, and she's at the police
station trying to talk her way out of having seen the murderer of a summoner.
Hunter always knew Alana was trouble, but his kind of trouble, and he's not
leaving Alana alone again.

Celeste Sweetwater, a new kind of demon, joins Hunter and Alana
and the rest of the demon guardians in a fight to find a new kind of portal
device that can summon several demons at once. But not only that, another
Matusa has been unleashed on the unsuspecting human world and the demon
guardians must stop him before he wreaks much more havoc.

But this time, the police are involved, paranormal investigators
pounce on the area, and the whole mess seems to be spiraling out of the demon
guardians' control.