Kage Kara Mamoru!

From AnimeCouncil²: In times gone past there was a Lord, one who loved Konnyaku. He loved it so much that he ordered his ninjas to protect the family of the finest Konnyaku makers in his land. The protection of the family continues even to today, Mamo-kun, youngest of the ninja family protects the innocent and naïve Yuuna from sinister forces, though more often from herself.