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[From Goddess Scans] It’s about a goodhearted boy named Takashi who murdered his teacher at age of 13, to protect his childhood friend Yui. The story revolves around tragedies happening to both of them because of that incident.
Aizawa was bullied by Suzuki to the point of becoming truant. He picks himself back up and becomes a teacher. 20 years later, his bully's daughter is one of his students and she's being harassed in class, a secret she keeps from her father.
Aizawa was relieved that after twenty years, Suzuki hadn't changed. The two met again at their school reunion, and his former bully Suzuki was as spiteful as ever. But little did he know, Aizawa was now a middle school teacher. And daughter is one of his students... beloved