Shounen Onmyouji, Nurarihyon no Mago Recommendations
A young boy must succeed his famous grandfather. Both also have supernatural and fantasy themes.
Both stories have a male protagonist which is going to inherit something from their grandfather. Both series also have demons from Japanese folklore.
similar atmosphere.. about fighting ayakashi...
Both are based on grandsons. They are both based on yokai and ayakashi.
-deals with ghosts and demons from japanese forklores
-protagonists are grandsons
-a bit of romance elements