Inuyasha must destroy a demon with a Shikon Shard before nightfall, because at sunset he will revert to a human for the night.; Totosai offers to forge Tenseiga into a true weapon, now that Sesshomaru's spirit has grown.; Totosai returns Tenseiga, complete with the power to open a warp in space between reality and the underworld.; Back in the twentieth century, Kagome tries to study for a make up exam with Inuyasha under foot.; While Miroku and Sango pursue Nikosen's head, Kagome and Inuyasha must take shelter from Nikosen's body, which has grown a new head.; Kagome discovers her enchanted arrows are useless against Nikosen.; After Tetsusaiga absorbs Nikosen's power of the sage, Kagome realizes that Naraku planned this on purpose so Inuyasha would have the power to kill Moryomaru. And Kanna comes to Moryomaru, claiming that she has fled Naraku.; The gang stumbles into the middle of a war between two conjoined demons.; Kagome seeks a way to get Kinka and Ginka to stop fighting. Moryomaru seeks a way to consume them.; Moryomaru discovers that bathing in the blood of Kinka and Ginka strengthens his armor to the point where it can resist the upgraded Tetsusaiga.