Aizaki Moa is Riku's childhood friend, and an agent for the Alien Investigation Bureau, a group who monitors aliens living on Earth. When her latest case seems to be tied to the Little Star incidents, the two are reunited just in time for a giant monster to attack.

After Zero and Leito transform to help Geed, the mild-mannered family man suddenly finds the prospect of being an Ultraman exciting. Riku doesn't appreciate the insinuation that being a hero is all fun and games, so the two decide to trade roles to figure out who has it rougher.