Rastina vs. the Vahhen Faction [Granblue Fantasy] (Yumano Yuuki)

A captive of the rogue Wappen Faction is subjected to horrific experiments, forced to gestate Primal Beast essences through implanted mana crystals and parasites. After a successful demonstration of conditioned subservience, the researchers deem the protagonist an optimized surrogate, but impending threats force them to abandon the facility. They dispose of the broken knight Rustina on-site while relocating the protagonist, until arriving Order members rescue Rustina in hopes of using her testimony against the faction.