Twelve-year old Aoyagi Ritsuka lost his only kin when his brother, Aoyagi Seimei, was killed under mysterious circumstances. One day, he meets Agatsuma Soubi , who claims to know his brother. It turns out that Soubi and Seimei used to be a fighting pair, whereby Soubi was the Fighter and Seimei was the Sacrifice . Now that Seimei is gone, Soubi "belongs" to Ritsuka who will become his new Sacrifice . After learning that Seimei was killed by an organisation known as the Nanatsu no Tsuki , Ritsuka decides to join forces with Soubi and investigate the truth behind his brother's death.
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