Toku de Zutto Soba ni Iru

Shimura Sakumi wakes up in a hospital after a traffic accident, and she has lost her memories of the latest 10 years.
The girl in fact believes to be still 17, but soon she has to face the reality.
So, hoping to recover her memories, she starts to learn little by little about her "adult self" and to search for the truth behind her accident, with the help of her boyfriend Hosomi and her high school friend Kaoru.