Mei Mi Hitomishima, who officially became a new member of the Bishounen Detective Team, had no choice but to participate in the cleaning of the ceiling of the art room under the summons of the team leader Futou Gakuin. Just as the project was in full swing, the members discovered a secret door on the ceiling of the art room. Hidden inside the ceiling were thirty-three wonderful paintings by unknown hands. As they explored these mysterious paintings, the members of the Bishounen Detective Team were surprised to find that these strange paintings were related to a mysterious incident that occurred in the school seven years ago...
