Start with a Belander, and Evolution Depends Entirely on Devouring It.

[The end of the world + mecha + revenge + upgrade to fight monsters + time travel] The world has undergone drastic changes, and the "Beast Realm" of another dimension has descended on Blue Star, and countless cities have been involved. Brutal monsters are raging, and human civilization is in danger. At the same time, "beast masters" who can contract and control monsters have also appeared among humans. The protagonist Lin Ruoran is an ordinary office worker. When disaster strikes, he awakens his talent for beast control. And contracted with the legendary mechanical life-Void Predator Belander.