Yaku (夜久): Yaku is another ninja of the Miroku clan, whom Miko meets when she decides to travel to the secret Miroku village. She is the only survivor (with Miko) of the Miroku massacre caused by Kamiri and Kugutsumen. Yaku is a powerful—and potentially very threatening—girl, for she transforms into a werewolf during a full moon unless she reaches an orgasm in time. Her most notable other attributes are her large breasts, of which Miko is envious.