Heres the back of all the books! Because I can't explain anything!>.<
Yen and Jin are brothers in elementary school and successors in the Ragun family craft of defeating evil spirits. In this world, the battle with spirits comes down to a game of guessing your opponent's "name." Once you know the name you gain control over the fight. Both Yen and Jin have secret names only they know ... and must keep them secret or risk death!
^ Thats the first book
Kana Mikami, who is part of the Mikami family, has a major crush on Yen Ragun... but is it really Yen she's in love with? When Kana is given a book that is rumored to grant wishes to its owner, will she make her move on Yen, or will she get burned?
^2nd book
Who's guarding the manor? That's the question Yen and Jin must answer when they confront the ghostly Maga that's haunting a creepy mansion! Can Jin master his special attack in time to slay the spooky specter?
^3rd book
Please note: I got this all from tokyopop.com