Tomonari Mashima/Relationships

Sae Chabashira
In volume 11.5 Kiyotaka called both him and Sae to talk with them. Kiyotaka told them about Tsukishiro and Why was Chairman Sakayanagi suspended. Ever since then Tomonari and Sae has been working together with Kiyotaka and Arisu.

Arisu Sakayanagi
His Student. He was surprised when he heard that Arisu and Kiyotaka are childhood friends. After hearing what Tsukishiro did he decided work together to stop him. Tomonari thought that students might not like Arisu giving Kiyotaka special treatment, but Arisu did not care about his or other opinions. Arisu said this is a temporary truce and when everything returns to normal she plans to face Kiyotaka with her full strength which made Tomonari happy.

D-class
Kiyotaka Ayanokouji

At first Tomonari did not thought too much of him until volume 11.5. Kiyotaka called him and Sae for talking after being recommendated by chairman Sakayangai. He brought Arisu with him. Tomonari was shocked to hear Kiyotaka's story that Suspension of chairman Sakayanagi was because of him and Tsukishiro did all of this just to get Kiyotaka expelled. Tomonari at first whenever to believe this or not, but when he considered student's feelings he decided to help Kiyotaka because he could not forgive Tsukishiro. He even asked Sae what kind of person Kiyotaka is and was really surprised by him.