Overview: While a murder is connected to the robbery of the sacred jewel, Seiya attends a week-long free class visit with Kyoko at the request of the Kindaichi boy. Seiya's goal is to have a delicious school lunch. However, when Seiya notices that the children have many likes and dislikes, he tells them the story of the “Mottainai Ghost” and stresses the importance of food. A security guard testifies that he saw a suspicious figure in the school building at night. Rumors spread that it was the “Mottainai Ghost". Kindaichi is asked by his favorite girl, Rei, to find out what it is.