Mao is the deputy supervisor of Nanba Prison's Building 2. His appearance and speech patterns are reminiscent of a cat.

He is introduced at a Nanba Prison supervisor meeting, filling in for Building 8's supervisor. Shortly after, he begins taunting Samon Gokuu, alleging that Samon may be a traitor similar to his brother Enki.

Age: 24
Height: 174 cm / 5.4 ft