The anime is about this boy named Shino Inuzaki. He is one of the survivors when his village was wiped out some five years ago. He is now with the other survivors Sosuke Inukawa and Hamiji. Shino has a secret. He looks like a young boy but he is actually eighteen years old and he wields a powerful sword called the Murasame. The sword has fused with his soul and it placed a curse in his body. The Imperial Church finds Shino fascinating and decided to invite him over to the capital. He seems to be associated with the supernatural like demons and monsters. Some series of strange events will now befall Shino and his friends where they will find themselves right in the center of it all.