From: Amazon on Fri, Nov 05 2010 9:57 PM

Just as Inuyasha and the gang overcome Naraku’s trap involving Kohaku, Sesshomaru, who is investigating the secrets of Inuyasha's transformation, is visiting Bokusenno, a demon tree whose wood was used to make the sheaths for the Tetsusaiga and the Tenseiga.

From: Amazon on Wed, Oct 13 2010 4:00 AM

Inuyasha goes to save Kagome from Manten. Hiten devours the sacred jewel shard that Manten had and absorbs his demon powers. Hiten attacks Inuyasha with his Raigekijin. Inuyasha is in trouble and defends himself with the scabbard of the Tetsusaiga.