There was a clear reason why Hajime shot Shimizu dead. He was not a broken human who would think nothing of murder. He was not a monster who couldn’t be understood. He wasn’t an enemy who blindly harm the students. Aiko decided to believe in him because he was a ‘student’, and her words could still reach him. With such thinking process, she recalled the shocking scene where a student shot another student to death, and she tried to search for the reason behind it.