Mayuko Saionji (西園寺 真由子 - Saionji Mayuko) is the mother of Ren Saionji.
Mayuko is the wife of Mr Saionji and the mother of Ren Saionji. She was a close friend of Katherine Livington, and they were classmates for four years at the art university they attended. When Katherine's son, Kanata, came to Japan to participate in MFG, the Saionji's allowed him to stay with them.
Mayuko hosts an art classroom, and invites Kanata to join her there at some point.