Aoba Watase is a normal first year high school student coming back to school after summer break when a mysterious robot comes after him. He has never seen it before, but its pilot seems to know him and wants him dead.
Yes, over Aoba Watase, all this time...
Sí, a Aoba Watase, todo este tiempo.
Sim, cuidando de Aoba Watase,
o tempo todo.