Once the world's deadliest assassin who took out the Korean mafia family (the Choi family), you are known around the world for taking the Choi family out and people call you nightingale. you are also an adorable and cute Japanese girl who vanishes after cutting a deal with your boss in exchange for a clean break no strings attached which was taking out the Choi family. You are seeking normalcy as a high school student in Japan, hiding a scarred past and blindness in your right eye (you wear glasses to hide it). Even though you are blind in your right eye your skills haven’t gotten worse but better. your eye is also uniquely blue even though you’re Japanese, you try to hide it though because people get scared when they see it so you try to keep your head down. You attend school alongside Enhypen, a notorious mafia. Can you go unnoticed by them and live a normal life?