Bomahead is about a girl and a robot who live in a junkyard. The robot claims he wants to fight for justice with hero-like abilities, but everything always turns out wrong. The mystery behind the girl and the robot are unraveled through a rapid succession of unexpected turn of events.

A Tyrannosaurus called Heart was raised by a herbivorous dinosaur. As he grew up, he was scared by other dinosaurs. One day, Heart meets a baby Ankylosaurus and he names the baby "Umasou (looks delicious)". Umasou started to be attached to Heart and a strange family love develops between the two.

Short spin-off episodes included in Blu-ray/DVD volumes of the main series.