Two individuals who had just befriended one another. Park Jimin- a newly transferred student and Erin. After a month being desk mate, they both experienced the same lost. Their squad that was supposed to be 5 in total had decreased to two and that was both of them. They were all killed in different places, time and method but by the same person. None of the college staffs did anything to solve the riddles left by the killer leaving those two in charge.  Not caring about the ri