The story begins abruptly in a university lecture. Psychology professor Tomiko Hagio describes the usefulness of pictures in diagnosing mental illness among children. She demonstrates this by using a picture drawn by one of her former patients, a young girl who killed her mother. The picture is of a smiling girl next to a tree that contains a bird in a nest. The professor explains that this picture indicated the girl’s loving nature and desire to protect the weak, so she felt the girl was mentally stable enough to rejoin society... Flash forward to 2014, when two students, members of the university Paranormal Club, investigate the mysterious death of a woman, Yuki Konno, who they suspect was murdered while giving birth. they come to this realization by piecing together random drawings on a blog. Somewhere else, a 6-year-old boy, Yuta, draws a disturbing drawing at the creche and shortly after goes missing. He is found by his mother at a cemetery, in front of the grave of another woman. Parallel to this, a professor's body is found deep in the mountains, leaving some strange pictures behind. No one is found suspect. All these separate short stories converge around the same woman, Naomi Konno, who as a child killed her mother and was diagnosed as stable again and apt to be reintroduced to society (this connects with the prologue).