Where the manga and anime follow Saya Otonashi's fight against the Chiropterans beat for beat, this official novelization fills in the gaps around it: deeper background on the decades-long war between her bloodline and these blood-feeding creatures, and on chevalier Hagi's long wait to find her again. Kai Miyagusuku and the rest of Saya's adoptive family keep their same roles from the anime. Across four volumes it expands the anime's story rather than retelling it.