Holly began as a chocolate bar, transformed into a spectral being. He is driven by his desire to join the "holly ghosts," a specialized unit led by the witch Majoline, dedicated to frightening humans.

To master ghostly abilities and the art of inducing fear, he trains alongside four fellow object-ghosts: Candy (candy), Toreppaa (toilet paper roll), and Piiton (green pepper). They undergo lessons focused on effective scare tactics.

His experiences are shaped by essential relationships within this team. Collaborative training and shared missions under Majoline's command define their dynamic, emphasizing mutual support during exercises and objectives.