Well nothing special here in this anime. A pair of demons come to earth to hunt bad demons. The difference between "Bad" demons and our "heroes" being a little fuzzy here. The girl is an ice demon and the male has a magic staff and a talking hat on his head. They are aided by a Kappa (local frog like spirit) who has gone native and spends most of his time on his cell phone. Our demons can also appear as gothy children as a clever disguise.
The mysteries don't have any bite even when a "vampire" is involved. The animation has a nice retro quality but nothing special. Worse any feeling of terror is mollified by "comic relief" where our hero is a constant perv. Nothing new in anime it is just something that grates very wrong here with the material.