It's Finn's 14th birthday. Him and Jake have organised a party for all the Princesses and royals of Ooo. Meanwhile the Princess and Marceline enjoy their time together at the party, only to have a close friend discover more than they imagined.

Princess Bubblegum unexpectedly visits Marceline's house, their relationship remains cautious as Marceline tries to reach for Bubblegums forgiveness. Using the only thing Marceline can capture the Princess's heart with she sings a song to her princess in an attempt to heal the love that once flared in their hearts.