Ultraman Zero talks with Ultraman Z about different teams formed among Ultraman like Ultimate Force Zero, Galaxy Rescue Force... that's where Ultraman Z asks Ultraman Zero about what is Galaxy Rescue Force. Zero finds it difficult to explain it so he calls Ultraman Ribut directly to explain that.
Ultraman Ribut arrives immediately and begins to explain and suddenly he gets a call about a mission. But he also assures that we'll get to know about it soon somewhere.
That somewhere is in Ultra Galaxy Fight: The Absolute Conspiracy!