Naraku abducts Rin in order to lure Sesshomaru into his lair.; Naraku attempts to absorb Sesshomaru's body into his own and assume Sesshomaru's demonic power.; Inuyasha pierces Naraku's shield and distracts him from devouring Sesshomaru.; Naraku orders Kohaku to kill Rin in order to cover his own escape.; Kohaku rebels against Naraku's control and attacks Sesshomaru, hoping the demon will kill him.; Kagome returns to the twentieth century to take an important math test. But she can't get any studying done for it because Inuyasha gets impatient for her return and travels to the twentieth century to retrieve her.; Parts of Naraku's golem reform on their own and pursue Koga, seeking to take his jewel shards.; The demon attempts to consume both Koga and Inuyasha.; Kikyo travels to Mt. Hakurei, a place reputed to cleanse even the most evil-stained soul.; The group travels to "Ogre's Head Castle", where a buried ogre's head may be responsible for the increase in demonic appearances in the area.