Really freaking good
The characters, story etc were all well developed, the story was interesting and quite realistically writen I think (of course with the light supernatural elements present) and the conclusion was very satisfactory.
I would love to see them being lovey-dovey as boyfriends ^^
(Also indeed the cover is misleading, one character is compared to a dog but no pet-play, colars or leashes are involved, no supernatural dog/wolf elements either.)
Ookami wo Katte imasu