Zero: Black Blood

At Club Lupo, Rei Suzumura is alerted to a Horror sitting nearby as he finds a group of Horrors about to eat a bloodied man that Silva identifies as being called a Blood Dolce. After killing off two of the Horrors as Zero, Rei encounters another in a white suit that overwhelms him with his feathers before telling him not to interfere as he takes the man named Katou with them. With Silva unable to track the mysterious Horror, knowing that Katou is beyond saving yet feels he deserves a better death, Rei asks his Madōgu to report the turn of events to the Western Watchdog. The next day, Rei is attacked by a mysterious girl with a Makai Blade, but their fight is interrupted by an eccentric man. After introducing herself as Yuna, she apologizes to Rei, saying she just wanted to test him, and her Makai Priest partner Kain explains that they have been assigned to work with Rei in going after the Horror he encountered: Ring. Rei does not trust either of them yet decides to hear them out after Yuna reveals Ring's unorthodox intent to create a human/Horror coexistence. As Rei treats Yuna and Kain to Club Lupo, Katou is fed to the Horrors in Ring's community.

Eating at Club Lupo, Kain reveals that Ring's planned coexistence requires only a few humans sacrificed. Once getting the information, Rei walks off with Yuna adamant to convince the Makai Knight to work with them. After stopping him and Kain from fighting, Yuna explains that she uses the Makai Blade of her father, a Makai Knight who died fighting Ring two years ago, with Kain having grafted the Makai Knight's bone into her arm so she can use her father's sword. Meanwhile, after accidentally hitting a woman with his car, killing her, a young man named Satoshi Wanda calls his girlfriend Natsumi of what happened and frets of learning of the woman's death. As night falls, Satoshi is visited by Ring who offers him a place in his utopia. When Natsumi almost ends up becoming the host of a Horror once she finds Satoshi, Rei arrives with Yuna and Kain as the three fight the Horror before Rei dons his Zero armor to kill it. Seeing Natsumi alive yet unconscious, Rei and his group realize they must infiltrate Ring's community.

Satoshi meets Koichi Nakaima who gives him a tour of the community, learning that Ring's beloved Iyu is a human who possesses a singing voice that instills calmness in the humans. After the tour, after giving Satoshi a card so he can call Natsumi, Nakaima is summoned by Ring to know that the number of Blood Dolces must be increased by two in relation to the Horror population. After Satoshi makes the call, Natsumi tells Rei's group of his location. However, the group learns that Ring has moved the community as the Horror attempts to have Rei understand his way of thinking. Upon seeing Rei's group is beyond reasoning, Ring prepares to kill them when Iyu appears and is revealed to be Yuna's mother before she is spirited off by Ring. Meanwhile, after being sent to Club Lupo to wait for the group's return, Natsumi has a visit from Nakaima.