Brave Exkaiser is from a Japanese animated television series that began in 1990, created by Sunrise under the direction of Katsuyoshi Yatabe, and is the first of the long running Yuusha or "Brave" metaseries funded by Takara and produced by Sunrise. You probably noticed tha it looks like a gundam. Well, that's because it's also from Sunrise, the creator of Gundam. The story takes place on a present day Earth that was secretly visited by a group of space police led by Exkaiser who were chasing after an evil gang of energy beings called The Geisters (led by Dino Geist). Upon arriving on Earth, Exkaiser and his team called the "Kaisers" put their spirits (Similar to Sparks of the Transformers mythos) into vehicles all over Japan so that they could convert them into transformable bodies for themselves.
You can find the papercraft parts here.
Update: All the parts plus the additional backpack have been released by turbolabo.