Hazama Seishiro is once again asked to solve a case at the school. This time it's about a glowing object appearing at the school, rumoured to be a ghost.
It's valentine day and Kitabayashi Yumi wanted to give the chocolate she made to Hazama-kun. When Hazama opens the box Kitabayashi gave him, there was no chocolate inside.
The rabbit kept by the school has been kidnapped and once again Hazama is asked to solve this case.