Watashi no Taisetsu na Tomodachi(2008)

Watashi no Taisetsu na Tomodachi

An Otaku girl meets a childhood friend who is really popular now. They talk and the friend relegates her to an "acquaintance." The friend gets in an accident & loses all memory, she then ends up in the same school as the Otaku girl who takes it upon herself to help rebuild the friendship they used to have.