Musashi is depressed: his black soul could deprive him of a kitetsu sword... and of his dream. But if this color inspires distrust in everyone, it also attracts the lust of Shirô Inukai. The wanderer approaches the young boy under the guise of compassion to try to transform him into a sword and thus extract from him the “obsidian goddess” of which he is the host! Overwhelmed by the power of his opponent, Musashi comes close to death. He only owes his survival to a happy coincidence, but it is now Kojirô and Tsugumi who are targeted by his assailant. Will he arrive in time to save them?!