Synopsis
Saya Otonashi wakes up with no memory of the past year. Her quiet life as a high school student shatters when she receives an ancient katana from a stranger. She soon learns that immortal creatures called Chiropterans are hiding in plain sight, masquerading as humans to feed on blood. As part of a group known as the Red Shield, Saya must fight these monsters while trying to understand her own forgotten past and the true nature of the threat facing humanity.
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