Inyō Kōitsu

"So the legend says... the opposing yin and yang forces will be reconciled by a hero of great strength and unrivaled heart."

- Kotarō Yagyū speaking of the Inyō Kōitsu's legend.

The Inyō Kōitsu (陰陽轟音, literally "Yin and Yang Roaring Together") is an advanced transformation taken by those that have managed to secure a great level of awareness of their energy, otherwise known as the Shinobi and the Samurai, accomplished through the reconcilation of Yin and Yang.

Behind the Scenes
While the main source of inspiration for this article is the Seidō Gōi technique in the manga series History's Strongest Disciple Kenichi, there is a hint of the Super Saiyan concept from the anime series Dragon Ball Z.