About the title
After the tragic death of her daughter, teacher Yuko Moriguchi comes to class to deliver her final, most important lesson. After that, her job at this school would be finished. But this was only the beginning of an elaborate revenge plan she had set in motion. Her class, after all, is far from a bunch of 13-year-old little angels with typical teenage problems - it's a gathering of cruel, cold-blooded monsters whose crimes go unpunished due to their young age.