Jigokuraku - Episode 11, 12 - Yuzuriha's Qi Aura

Yuzuriha doesn't know the concept of Tao, but ninjas in her village learned how to collect and use Qi.

As Sagiri, Yuzuriha, and Sento fought Zhu Jin, they learned how the mysterious island was not Paradise. It was an island full of living experimental subjects on how Tao operates. The leaders have eternal life but haven't found a way to extend eternal youth. None of that matters for the executioners and criminals. They looked for the elixir of life, but there wasn't one. However, Sagari discovered how to concentrate her Tao to give Zhu Jin wounds he could not heal. Unfortunately, Zhu Jin did not die. He only took his time transforming into his extreme monster form. Sento gave his life protecting Yuzuriha, and all hope looked lost. Then a sudden cliffhanger rescue happened! The season finale is next week.