Recovering the first Prophecy Book nearly cost Tsukimiya her life, so securing the second will be no small feat. Now that Satsuki has mobilized in the race to collect God's inheritance, he and Tsuzuki clash violently when the second Book and its key appear simultaneously in two separate locations. Tsuzuki has the conviction, but does he have the strength to defeat the fallen angel, whose determination is such that he is willing to fly in the face of God himself?