Rui Tatsumi

Rui is the leader of Team Hiragi who attended the same middle school as Kaito and Tooru. He has always wanted to surpass Kaito even at a young age. Though he is kind, he is very confident in his and his team's skills, claiming not to see Team Otori as threats. He is childhood friends with Eigo, and they were often called "Princess" and "Knight".

(Source: Wiki)