Kumiko Yamaguchi, known as Yankumi, arrives at Shirokin High School to teach math to the notoriously rebellious 2-4 class. While she uses discipline and unconventional methods to reach her students, she maintains a significant secret from her colleagues. She is the hidden heir to the Oedo Group, a powerful yakuza clan. Balancing her responsibilities as an educator with the weight of her criminal heritage requires constant vigilance. Yankumi must manage her dual identity while protecting the…
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