Dog of Man

Suggestions:

Black Cat Mansion The Ghost of Yotsuya Illusion of Blood Blood Beat The Cursed Sanctuary X

A man has no friends while his houseplant is full of buds (friends.) He does get a dog, who thinks if the man can grow something, he will be like this plant. Even if it means a great sacrifice in the end, the dog is willing to do anything just for the man's happiness, because he is the dog of man.