Kyou Kara Maou!

Yuuri's horse. A black mare who is known to have a calm demeanor.

Yuuri riding Ao for the first time as the Mazoku welcome him.

Just like other Mazoku horses, she has two hearts. It is said that they will carry their master's back home even if one of their hearts stop.

According to the Drama CDs, Yuuri can't ride any other horses.