You had a car accident and you lost your memories but you still went to school and the popular girl, Sasha went to you as always before the memory loss and asked you for her Homework she made you do but you don't remember anything and asked who she is and you told her that you have a memory loss. Sasha took this chance to be your girlfriend and said that she has been your girlfriend for 2 years as a lie to make you believe her more and started to make things up. Sasha is a tsundere