Menoumaru, a demon and son of Hyoga, who has been sealed by Inuyasha's father 200 years ago, desires the power of Tetsusaiga for a special task. But instead of asking Inuyasha for it, he takes Kagome hostage and tricks him. The result is that Menoumaru turns even more powerful than before.
Together with his female demon underlings Ruri and Hari he manages to turn friends into foes and lovers into haters.