For me it's 9/10 This is the first time I like a manga with student and teacher realtionship. Usually I always drop this kind of trope in the first chapter but this story really hook me. It's a story about our MC who want to get revenge to the person who killed her parents. Ironically the murderer is her teacher. Instead of imidiatelly take revenge on the teacher she actually ask him to teach her how to kill someone since the teacher is a pro and she have never kill anyone. The teacher for some reason accept her request. The Teacher is weirdly fond of herand that's the interesting part. This manga have romance but don't worry they won't be together, trust me. One of the reason why I stay reading this because the teacher is hot lmao. But really the story is really good and really leave me empty after reading it.