It was a shounen.
The story was something like this:
It was about a boy whose grandpa died and he left a samurai sword. the boy was able to see demons and the sword was a demon too. and this demon sat on the roof of the grandpa's house waiting for someone. he didn't want the boy to touch him. and someday came a big, fat, disgusting demon, that consisted of the people the sword had killed. and for any reason the sword demon and the boy were able to defeat this evil demon together.
happy end
yeah... I know my storytelling is horrible
