Jomatsu is a yōkai who briefly appears in the series.
He is extremely loyal to Princess Anmo, and is deeply in love with her. He is also very patient with the princess. He gets flustered whenever he talks about her and even made a request to the Mononokean for giving her a gift of something special from the mundane world. He gets very happy at the idea of staying by Princess Anmo's side forever and cherish his flight with her in the Underworld.