They were 11

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Based on a Japanese folklore tale, retold in a future setting, They were 11 takes place in the distant future. The final exam for 10 students is to survive 53 days aboard a lifeless spaceship, problem is, that there seem to be 11 students aboard the ship.

Who is the impostor?? And what is their intent??

Even after finding the answers to these questions, They were 11 is still a pretty good story.