Zoe Renée Davis is a 16 year old girl who lives in a Orphanage. And, Megan Nicole Dawn is a 6 year old girl who lives in the same Orphanage. When a young woman adopts them, they meet the boys of 5 Seconds of Summer. Zoe has a bad anxiety attack and the cant find Zoe Renée Davis so, they do a DNA test on both girls. Even though the girls aren't the same blood type. They find out their Luke's younger sister.