Saejima-kun (冴島くん)

Saejima works at the same place as Himuro, Fuyutsuki, and Komori.

Saejima is close to Komori and possibly has romantic feelings towards her. His conversations with her usually resulted in her blushing, even tho she was clueless about his feelings.
Although Saejima and Komori are clueless about each other's feelings, they're fully aware of Himuro and Fuyutsuki's situation.

Whenever Himuro became flustered, or a snowstorm of emotion is covering him, Saejima will usually be there to make comments about the situation.