She is the most outstanding killer of the "Dream" organization and the most troublesome killer. She went into seclusion after an accident. It wasn't until the leader of "Dream" came to find her in person that she finally appeared. Plastic surgery, changing the identity of another person, replacing another person.
She is the most ordinary student. She has been bullied by her sister since childhood but never dared to say a word. Until one day her sister's temperament suddenly changed and she didn't know how to react.
Then the story begins like this...