The general manager of the Shibano Neo Pro-Wrestling teams, the daughter of Kozo Shibano, and the heiress to Shibano Enterprises. Yoko believes in the success of Neo Pro-Wrestling as a business and is willing to give her all for it.

~!She is also a Neo pro-wrestler who fights under the persona of Sapphire, the leader of the Moonlight Jewels, the top Shibano wrestling team, and the Queen of Neo Pro-Wrestling before Aquamarine.!~

(Source: Wikipedia)

In the near future, the sports world is dominated by Neo Wrestling, a new spectacle in which Metal Fighters challenge each other to be named champion. The story follows the girls of the Pretty Four; Miku, Ginko, Sayaka, and Nana, as they face off against the current champions, Team Sapphire. With a burnt out drunk named Eiichi Suo for a coach the girls must not only contend with problems in the arena but also unforseen circumstances that arise in day to day life. Only through protecting their friends, understanding their enemies, and eventually challenging their idol Aquamarine, can Miku and the girls understand Eiichi's purpose and the shady secrets behind Neo Wrestling.
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(Source: Anime News Network)

Yoko Shibano