Hello there Rizu-san; I had this idea based off the otome game Always Remember Me, it is about a couple who get in a car accident. While the girl is pretty much alright the boy suffers amnesia and forgets about her. The RP would be based after the alone ending, where the boy (Aaron) goes off with his previous ex girlfriend back to Seattle where he can fully recover. While the girl (Amy) goes on with her life without him.
The RP would take place a year later where Aaron has suffered yet another head injury after he tripped down a few steps. That head injury would cause him to remember everything about Amy and remind him of how much he loved her, and still does. So Aaron goes to track her down to see if she will take him back but...she is already engaged to be married to someone else. Now it is up to Aaron to try and win back the love of his life before he looses her a second time.
yum_puddi