Shishinmai

Shishinmai (四神舞) is a secret technique of Kyokushin Karate (極真會館) invented by the human practitioner Seidō Shōri, but mostly being known as the 'Ultimate Hakuda technique' of Eisei Shōkei.

History
When the foundation of Kyokushin Karate in 1964 has been exposed to the entire region of Japan, Masutatsu Ōyama (大山倍達), the founder of the art, decides to take on the 'new stage' of martial arts along with his best disciple, Seidō Shōri. After their discovery of the afterlife, Soul Society, and the Shinigamis, they then began to train under the tutelage of the Martial God and also the exiled who banished from, who refused to tell them his name. 30 years later, after the training they hide from the face of the earth, both the teacher and the scholar has reached the 'final' step of their art and also other Hakuda Techniques the mysterious Shinigami has taught them, and Masutatsu's life has finally come to an end and decides that Seidō will be the next grandmaster of Kyokushin, which he wholeheartedly agreed as the Martial God performed the, sending the martial artist's soul to the Rukongai. 2 years later, the strangely matured boy has come to the dojo and ask the fuddled Kyokushin Grandmaster to train him, which he amusedly accepts, further increased the existence of the technique he and his master had spent 3 decades mastered.