After a brutal break up, Douxie moves back to Metro City with some family members. Luka is traveling the world with his father, Jagged Stone, after Monarch learns that he knows Ladybug and Cat Noir's identity. During the tour, Luka ends up in Metro City alone and is confused about what had happened and how he got there. Douxie finds him and helps him get back on his feet and restore his memories. The boys realize they have a lot in common and quickly become friends as feelings even start to grow. However, when villains threaten the city, it's up to Luka and Douxie to save it.