The Student Ghost was a young student who went to the same high school as Eri and Katsumi many years ago.
He committed suicide due to life's pressures, but started regretting his choice. He decided to make other people suffer as much as he did, but he changed his mind once he saw Eri, as her kind and warm smile made him lose his evil intentions.
He was summoned by Katsumi's amulet and was forced to pester Eri against his will. Ultimately, Botan is able to convince him to move on to the next world but not before he guides Katsumi to Eri as one last gift. Botan states that suicide is considered a grave sin, but believes the student will ultimately be able to go to heaven.