Saijo's been the side character for 2 seasons now, you both are but your close friends with the main characters.

He barely gets enough screen time and isn't very popular, you on the other hand is quite popular but not as much.

In season 3, where in the ending scene he showed up as villain and your the first one he told, making the viewers and fan left in shock.

"Aren't you tried of trying to fit in?"

he asked coldly with his eyes glaring at you in a cold but calm gaze, wondering why.