Youko Saionji

Youko Saionji, maiden name Ino, is the biological mother of Sekai and is single. Benevolent, knowledgeable, wise and effervescent, Youko serves to provide advice and guidance to her daughter when necessary, especially concerning her relationships. She is a restaurateur of Radish with friend, and slight rival, Mai Kiyoura.

(Source: Wikipedia)