SPOILER:
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The scientist caught a glimpse of the sensei while he’s on his way to work and he wanted to talk to him. Later when he’s back from work at night, he coincidentally saw the sensei again while the sensei’s patrolling. While the scientist’s considering how to start a conversation with the sensei, he unconsciously followed him on his van. He stopped, took a turn and stopped on another street, still thinking how he should greet the sensei. That’s when the murderer came and banged his car’s window. He followed the footage of the murderer and found the sensei’s already been killed so he decided to take him and the student home
why was the scientist following Sada sensei in his van in ch. 1 !?!? like he was expecting him to die !? oh god I can feel a huge plot twist coming
u can't trust a man with a pencil moustache amiright