Thread:SonikkuAensland/@comment-5688420-20170217164321/@comment-5688420-20170218114840

BH: The "Butterfly Killer". A male serial murderer who is known for leaving cutouts of black butterfoes on the bodies of his fallen victims. He is also known for using LSD to cause hallucinations towards his victims before killing them. In the end, turns out to be Takaaki Sugo, Kotobuki's right-hand man.

yUi: "Ui", a mysterious girl who has killed a bunch of students who enter the school in nighttime. Also something of a reality warper, but these may or may not be the effects of LSD. There seems to be a link between Yuu and Ui, but there is also speculation that she may be related to Takaaki Sugo instead.