Mitsuba (ミツバ), whose real name is Mitsuba Sousuke (三葉惣助) is a ghost haunting Kamome Academy Middle School's lockers. He was a student at Kamome Academy's Middle School division and was a member of the photography club before his death. After being recreated by Yugi Tsukasa, he consumed the former School Mystery No.3's heart and is now currently the representative of the 3rd School Mystery.