Well it's kinda strange and interesting at the same time, when the girl goes into an accident she goes back to august 1st and dates another guy like when she dated Shin and now she's dating Ikki i guess her memory stopped at August 1st and thus when ever she goes into an accident she then go back to August 1st. She's supposed to regain her memories back so that she could continue her life and never get back to August 1st again...