InuYasha's brother Sesshomaru returns, anxious to avenge his missing arm...he meets Naraku and accepts his "deal," a human arm in which a shard of the Shikon jewel has been imbedded--an arm which COULD grasp Tetsuaiga! In return he must agree to kill InuYasha, a task he has no problem accepting.
The grim battle between the brothers has horrific consequences--and InuYasha becomes fearful that he is unable to protect Kagome sufficiently.