After you've confronted Ceroba, and beat her in a fight, she gets up from the ground after being knocked down by your big shot attack from your gun, a determined look on her face

Ceroba: "So it's come to this. ... "My last resort."

she takes out a white mask with with red marks on it

"For Chujin...." "For Kanako..." she then puts the Mask on, and looks back down at you

"For the future of Monsterkind!!"

a white light surrounds her, as she floats up, and after a bit of being blinded, you see her, in her Kitsune Form

Ceroba: .... she stays silent, as a yellow rite lantern starts shooting bullets at you

Absolute Devotion.