Mobile Boyfriend + (2012)

Megumi is a hikikomori who refuses to go to school. She uses the app "Katekyo Plus", in which an avatar of a teacher teaches to study. One day, classmate Souta arrives to report the death of her friend Manami. However that same evening, Megumi receives a email from Manami, who should be dead, which triggers Megumi's avatar teacher to switch to another person.