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.

Spoiler

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)