​Takuma has come a long way as a hero and lover, but just how did he get involved with the nine valkyrie sisters? Discover the oh-so-revealing origins of Natsuki's first voyage to Japan from Asgard, and her passionate first lovers' contract with Takuma! The future is just as important as the past, though-- an unexpected visitor has arrived to tell the truth of why the valkyries were sent to Earth!