Conan solves the case and reveals the culprit was a close friend to the dead student. The culprit reveals that he found his friend's desk in the storage room with a name on it, thinking he was murdered. The other students reveal that he died saving a student that fell off the stairs while holding a heavy sculpture. Another student explains that his desk was put in the storage room to store his desk for graduation and was not to hide evidence. Dr.Araide reveals that the dead student held no grudges when he died. (thetvdb.com)