Bokurano 2: Ours

Reads R to L (Japanese Style). Saving the world is hard. Saving yourself is even harder.

Saving the world is hard. Saving yourself is even harder. Giant robots are invading Earth and fifteen teenagers must figure out a way to stop them. The key to mankind's survival is a towering mecha known as Zearth, but the iron giant's power is not infinite. It gets its strength from the power of life supplied by each teenage pilot. That's a deadly price to pay for someone not yet in high school.