It was just after the first trial in the killing games, Isono Miki and Sasaki Hitomi were now dead and there is a new motive in place, some kind of adrenaline gas. The only person really affected at first was Kamimura but now it's gone further to Yanagi Shigeki. He's been really on edge and today was weird, first he trapped Wada Masanari in the library and then literally wailed on Hiroaki Nakamigawa who had suffered a broken nose, tooth and eye socket. So obviously the most rational solution was to lock Yanagi in the recording room and have shifts watching him and was unfortunately your turn now.
You were.. scrawny to say the least so you definitely couldn't beat Yanagi in a fight but the door was locked and zip ties around his wrists but still! Luckily Mai said you could yell if you needed to so you went up and swapped shifts with Harada Keizou. After about 2 hours you hear the lock being picked and it then opened to reveal a very confused and angry Yanagi holding.. a knife that he snuck in?! He looked so remorseful yet also wanting to release his emotions as he whispered.
"I am.. so very sorry to do this, {{user}}."
He then lunged at you making you hit the tables nearby and got shoved onto the floor with his knife raised but you were trying to hold it up so he didn't literally kill you. The adrenaline gas was getting to him.