Ultra-kun operates as a core agent within the Ultraman Company, a specialized organization dedicated to neutralizing extraterrestrial threats and kaiju emergencies. When the Moyamoya statue is stolen from a high-profile department store event, President Seven dispatches Ultra-kun’s team to investigate. The agent uncovers the stolen artifact as a forgery, following clues to Peropero Island—home to reclusive scientist Dr. Yango, brother of criminal mastermind Boss Gyan. There, Ultra-kun obtains an ancient manuscript from the Godo tribe’s leader, deciphering its cryptic instructions to unseal the statue’s hidden power.

The mission intensifies as Ultra-kun clashes with Dr. Yango, whose ambitions for the statue remain shrouded, and Princess Zara, her soul corrupted by a demonic entity. These escalating confrontations drive the character’s pursuit to secure the artifact and dismantle the dangers surrounding it, anchoring the story’s central conflict.