Shachi is the son of Akashachi the pirate. Shachi was left behind in Asura after Akashachi fled during an attack and there he became romantically involved with Leia a local girl. He became Jukeis fourth student and learned Hokuto Ryken to protect Leia. He began fighting against the Asuras eventually earning a reputation as Rakshasa. At first he only teams up with Ken to use him in his plot to destroy the three Rash allowing Lin to be captured by Kaioh so that Ken would fight him. Source: Wikipedia