Interstellar Apocalypse: A Disabled Guide's Survival Guide

[Sentinel-and-guide, beloved by all, dark-themed, with male rivalry; the heroine is no pushover] As the story progresses, the heroine grows ruthless and cruel. Though she seems like a fragile guide, her hands are stained with sentinel blood. Qu Fengran has lost her memory. The moment she opens her eyes, she finds herself in a stark white hospital ward. She knows she's not from this era. But when she learns that the original owner missed out on a promotion and a raise because of an injury, she can't help feeling regret on her behalf. Gradually, she discovers that despite being a guide, she has no spirit form. Having a B-rank but no spirit form is unheard of in the interstellar world. What's more, life in the Central White Tower makes her feel utterly stifled. So the first thing to do after losing her memory: escape the Central White Tower.