Ep. 12: Irmãos Sakamaki enfrentam fundadores vampiros que buscam Yui enquanto escolhem seu Adam sob a lua vermelha

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The Sakamaki's are attacked by the same pack of wolves who attacked the Mukami's. After that, they realized that those wolves are from the founders of the vampires, which include 2 people, and they are looking for Yui's blood. This prompts Ayato to pursue Yui to the Mukami household and take her away, but Ruki stop him and suggest that they should make an alliance to protect Yui from the founders. But the fact Yui belong to who which cause Ayato & Ruki both suck Yui's blood to say that she belongs to them. Resuming the episode, Ruki came to Yui and tell her to make a decision and choose her "Adam", as Yui and the Mukami brothers looking at the red moon. (Source: Wikipedia)