Find a manga about a boy who uses heavy hammer as weapon It's about a boy who have a hammer as a weapon, which is very heavy. His father died protecting hiim. The manga is about him having an adventure. He also has some companion. One of them has handsome face but small body and he has to wear a mask to hide that.
It is crocket!. 
http://myanimelist.net/manga/17005/Croket!

I have found it after scanning 600 titles on myanimelist