Ghostly Girl (2013)

Teacher Akira Kamiyama tried to stop a bullying case and the bullying became his own trauma. Since then, Akira has decided to not get involved if its not absolutely necessary. He then begins teaching at a middle school and moves into a new apartment. Akira then discovers that his apartment also houses a ghost named Akane, who was a teacher before she died. Akira Kamiyama and Akane then solve problems which the middle school students have.