17-year old Takeshi Kengo is a mild Gunpla enthusiast until one day is summoned to another world, wherein he gains an amazing power, the ability to become himself a Gundam! But a dark cloud is hanging over his new home and he might just be the only person who can save it.

A new adventure leads the Gundam Force on a quest to find out the truth behind the Zakorello Gate and the Dark Axis. Along with it will come surprising new tales, allies, and enemies. But all have one agenda: to seek the power that keeps darkness at bay. Can the SDG reunite all the scattered worlds into one whole world?

Cpt. Gundam saved Neotopia from the BaguBagu's petrifying effect by reverse the effect. However unexpected side effect scattered normal BaguBagu to various different dimensions. One of these various dimension was that of Avatar the Last Airbender

A weakening of the boundaries brings two citizens of Night Town into Neotopia...and a clash with the Dark Axis.

Due to the instability of inter-dimensional travel, Vash and Wolfwood end up in Neotopia and Knives and Legato end up with the Dark Axis! What craziness will occur when the worlds of the gunslingers and adorable robots meet?