Teppei is reunited with his brother Kotaro, but will joining forces be enough to defeat the Machine Emperor and his B’t Raphaello? Kotaro forces an audience with the Machine Emperor, and finally sees his true form and comes to understand his horrible aspirations, but it may be too late, since Raphaello is already on a rampage! Can Teppei and the B’t gang stop him from destroying the world?!
— Description from Comic Vine community (comicvine.gamespot.com).
