Guro & Ruby

Guro & Ruby (Guro to Rubī) is a Japanese anime series created by Waku Yaniko.

Plot
Guro, a creature from magic world who can only say his own name, is the royal adviser to Princess Ruby but one day, Kuroban, Guro's villainous brother, escaped into the human world with the golden heart so Ruby and Guro must go to the human world to get the golden heart back while fighting bad guys and obsessive otakus on the way.