《白箱》剧中剧，BD/DVD第七卷特典。

Japanese anime television series

2014年6月底，在《希德尼娅的骑士》一期动画最终话的片尾公布了二期动画《希德尼娅的骑士：第九行星战役》制作决定，并将在11月举办二期动画第一、二话的先行上映会，上映会门票将在动画第一、二卷中限量附赠。此外，原作中的重要角色“白羽衣紬”也将在第二期动画中登场；而原作者贰瓶勉的早期作品《BLAME！》亦会在第二期动画中以剧中剧的形式动画化。

The year is 3394. The solar system has been long destroyed by a strange alien race called Gauna. Now humans are barely maintaining population in their seed ships - the ones they also used to escape a thousand years ago. After several years of drifting though space, Sidonia, a seed ship with a population of over 500,000 people, is once again threatened by Gauna. Follow Tanikaze Nagate, a mysterious young man from the deep corners of the ship, and his friends as they try to strike back against these gigantic creatures and at the same time learn what they really are for the sake of humanity's survival. -MAL