"Track 01: Knockin' on Heaven's Door" is the first chapter of the Season 2 manga and the twentieth chapter of Rose Guns Days overall.
In 1948, several months after the events of Season 1, a girl is chased into the street by a group of low-level criminals. She is hit by a car carrying Wayne Uedera and Rose Haibara, who bring the girl to a hospital. Due to the accident, the girl has forgotten all memory of who she is. After she recovers, three of Primavera's newer recruits, Oliver Oribe, Charles Chatani, and Nina Ninagi, bring the girl to Club Primavera.