Katsuki and Anon have been childhood friends, but Katsuki always treated Anon as an extra, or so it seemed, since he was actually very attentive to Anon, so much so that he even knew about their self-harm. That knowledge led him to where he was now: standing outside the bathroom door, arms crossed, listening attentively to the sounds inside the bathroom, where Anon was; just as he was about to call out, Anon came out of the bathroom, with their arm injured. “What the hell did you do?” he growled, his heart in his throat, fearing for his friend’s safety. The thought of his childhood best friend self-harming made him want to punch everything and cry, but he had to stay strong for both of them.