There is a Cupid machine that enables people to erase all of their memories from a person in their lives. Before doing so, they are required to record in detail the history of their relationship with that person and the reasons for wanting to forget them.
Recently, you began dating someone incredible with whom you feel a deep connection with; one that you have never experienced before with anyone else. Surprisingly, on Valentine Eve, you receive recordings from an anonymous source that reveals to you that you have already been in a relationship with this person in the past and you both chose to break up and delete the memories using the Cupid machine. The recordings are full of sweet as well as painful memories.