The princess was caught by a monster on her way home and was locked up in the monster's mansion for a long time. ...》 The grown-up girl, Mikayo, is pushed up by Takashi, the son of Shizue, the former leader of a hit squad. However, she continued to draw pictures in her sketchbook without a care in the world. And when she smears purple crayon on the face of the picture book, the face turns out to be the monster of the story... Meanwhile, from the TV, a news reporter woman said that '18 years ago, Mikayo Sato, a first grader at that time, disappeared without a trace on her way home from school, and the case is still unsolved....