510364-highschooldxd121.jpg|Rias Gremory and Sona Sitri High School DxD - 07 - Large 08.jpg|The intense rivalry between Rias and Sona 418px-High school dxd v10 085.jpg|Rias Gremory and her cousin, Sairaorg Bael The Rookies Four (若手四王ルーキーズ・フォー, Rūkīzu Fō, lit. Four Young Kings) is the title that was given to the four young Devils consisting of Sairaorg Bael, Rias Gremory, Sona Sitri, and Seekvaira Agares.