What is it?
The anime (animated) movie They Were Eleven.
What is it about?
This is how Rotten Tomatoes describes this movie:
In this gripping futuristic anime, 10 space cadets have their survival skills put to the ultimate test when their crippled spacecraft is set adrift in the cosmos.
To add a degree of difficulty, one of the cadets just might be an impostor intent on destroying the ship before the wayward space travelers can get home.