Bokurano is a dark science fiction manga about fifteen children who discover a mysterious man on a beach who tricks them into signing a contract to pilot a giant robot. They soon learn that each battle against a monster uses the life force of the pilot, and after each fight, the pilot dies. The story follows each child in turn as they confront their own personal struggles, fears, and the unfairness of their situation, knowing they are doomed to die. Readers enjoy the series for its unflinching moral complexity, emotional depth, and how it explores themes of sacrifice, mortality, and responsibility without easy answers or heroism.