The Protector of the Grimoire (Dance with Devils)

A long time ago the goddess Amaterasu sent her Okami to protect the Grimoire and stop it from falling into the wrong hands, it eventually fought a hideous demon. Luckily the Okami killed it but in return it died, but now the Okami has been reborn as a male human and having to deal with school and devils. Just how will he protect the Grimoire?