Yakusugi is a mysterious old man who's mastered the mystic art of Tantric Buddhism, and is said to be the strongest human (this would arguably make him more powerful than Gai is at the time, although as a cyborg and an evoluder, Gai is likely no longer a mere human). Yakusuki is said to possess the greatest amount of power a human possibly can. Yakusugi gets smacked into a concrete wall with enough force to break it. Yakusugi is able to temporarily block the Dr Mamon Brahmans attack, though his defences are eventually overwhelmed, and the section of the concrete roof he's standing on is destroyed. Yakusugi unleashes his final, ultimate attack which causes a colossal explosion; Amogashidde. However, it's use seemingly kills him in the process.