That sounds like an anime I would like.
I liked ajin cuz I just thought the artwork was beautiful, at first it hits the eye weird, but then I really started to appreciate it, also the things the ajin could do were pretty friggin' cool ;D
Best way to beat that guy is to throw crystal meth on a shag carpet and tell him to knock himself out.
That oughta distract him enough for you to beat his ass ;D