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An interplanetary group of 10 military academy cadets set out on their end-of-course test. They have to take an elderly spaceship out into space and survive 53 days without outside help. Any one of them can give up, but if so, they all fail. Then they find there are 11 people on board. One of them is an imposter, and they can't contact the academy to find out who it is or whether it's all part of the test. A series of incidents and accidents, trivial at first, grow increasingly threatening, and their personal strengths and weaknesses, as well as the social and political agendas of their different races, have a wider impact than on the outcome of this test alone. The anime version of Moto Hagio's suspenseful 1975 manga is delicate but powerful, a miniature gem.