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Saya Otonashi is a seemingly ordinary girl living a mundane life with her adoptive family in Okinawa City. In fact, her only peculiarities are suffering from anemia and being unable to remember any of her life beyond the previous year. However, Saya's forgotten past quickly comes back to haunt her—one night, she is attacked at school by a creature that feeds on human blood. Just when all hope seems lost, a mysterious man named Haji appears and fends off the creature temporarily. But when her rescuer forces her to drink his blood, Saya suddenly enters a trance and slays the monster with ease, using her own blood as a catalyst. Saya then learns of an organization named Red Shield, founded for the sole purpose of defeating the hellish beasts. Now Saya and Haji must work together with Red Shield to fight these fearsome monsters and unlock the secrets to the girl's past. [Written by MAL Rewrite]

As a child, Yuu Kusaka made a vow upon a shooting star that he would stand on the side of justice and defend the weak. However, the death of one of his friends robs him of the desire to live up to that vow, and he turns a blind eye to the misery of others, using the mysterious power he possesses as a means of making money instead of helping those in need. His days of living only for himself continue, until he's forced to fight for his life against another classmate with powers similar to his. He's saved by a mysterious girl named Eimu Yoake, who also has strange powers. Eimu reveals that his powers stem from a creature known as an Ayakashi, a parasitic being that grants the user special abilities at the price of slowly draining the life of the host. She helps him fully awaken his own. Now aware of the ayakashi he possesses, Yuu must live up to his childhood vow, putting his ayakashi to use and fend off those who would use their own for evil, all while unraveling the mystery behind the death of his friend.