This is a dog you can't put down!
Goto and Leon, fed up with all the secrecy of Kerberos, decide to discover once and for all what the "psi" is by their own means... But they are not the only ones looking for answers! Their most lethal enemy to date, Griffin, is looking for the same thing, and it might be too much for the Hellhounds. Meanwhile, Sakuya must deal with a crisis on her own, and in the process come to terms with her own identity as Nayuta. It's the spectacular finale to this gripping story!