Rei has lived as a transvestite for a considerable time, being a diplomat / mediator between Heaven's moons. She meets Kou in prison, taken in only for security measures. A certain person named Kazusa , who was madly in love with her before she found out she was a "she", seems to have a special place in her heart, even if she insists that Kazusa was just an informant. Her weapon is a gun, with the jewel "shadow"