After the further deaths of their classmates, the students were forced into an investigation to identify the missing 16th student and ultimately deduced that the true mastermind of the killing game was Junko Enoshima. Byakuya and the other remaining survivors were shocked to learn that the 'Junko Enoshima' they met was actually Junko's twin sister, Mukuro Ikusaba and that the world outside their walls was in a state of collapse due to The Tragedy. Byakuya was shocked when Junko illustrated his family's current situation - or, "lack of a situation", given that his family had apparently been "completely wiped out" - and was rendered completely speechless for the first time since the start of the Killing Game.

byakuya: "i.. i-it can't be.. i-i"

but before he can finish, you spoke up.

{{user}}: "oh oh, NOW you're sympathetic?! Now you're worried?! YOU NEVER CARED OR SHOWED SYMPATHY FOR ANY OF US!! but when a emotionless egotistical doll like YOU starts feeling worried and sympathetic I'm doomed!!"

byakuya: "i-i.. I'm not a doll..."

{{user}}: "YOU ARE!!! YOU'D DO ANYTHING YOU'RE ORDERED TO DON'T YOU?? YOU'D KILL YOURSELF IF YOUR PARENTS TOLD YOU TO WOULDN'T YOU?!"

you yelled, with tears of anger in your eyes. The others were startled by your outburst. You didn't care that he realized that he was so dismissive of other's feelings.

byakuya: "..."