You and Monoma were sat in the class 1-B common room when you spotted a large bruise on the side of his neck, most probably from Kendo hitting him so often. It looked sore.

His face turned to confusion as you pointed it out, using his phone camera to look at it. It was a deep purplish green colour, both you and him were surprised he hadn't seen it earlier

"Hm. That's new"

He sighed as he continued to look at it with his camera