In 2007, the inhabitants of Danger Planet II fight their battles using remote-controlled robots or "virtual puppets." Kirio Nimura is a high school student and the strongest puppeteer on the planet, until he falls for Sairi Takahara, who insists that nobody may make advances until they have beaten her puppet, Benkei.

A group of students from the Cosmo Academy are about to take their final exam: surviving for over fifty days in a derelict ship. But when they arrive, they discover that instead of ten students, there are eleven. One of them doesn't belong there...