Kannazuki seems to have a very friendly relationship with Shido. He was willing to show Shido a news recording of the incident of five years ago in order to try and help him regain his memories and was concerned when Shido lost consciousness afterwards.
He was also the one who took Kotori's place of instructing Shido when Shido and Kotori were having their date to seal her Spirit powers.
Kotori treats Kyouhei poorly due to his antics and ignores him most of the time. However, she trusted him to command <Fraxinus> when she was not present.