Nishiwaki is a member of the Kiheikan dojo and an underling of Hiruma Kihei and Gohei. While the Hiruma brothers take a group to the Kamiya dojo in order to force Kamiya Kaoru to sign over the deed to her land, Nishiwaki remains behind with the group at Kiheikan and is met by Himura Kenshin. After being defeated by Kenshin, Nishiwaki is brought to the Kamiya dojo as a barely-conscious shield and when the Hiruma brothers are arrested, the Kiheikan group disperses and is not heard from again.