Krystal Novaty Nokanatika

Krystal is Satou's childhood friend. She is a mysterious girl who appeared one day with her grandfather. In truth, she is the princess of the magical land of Nokanatika, sent to Earth to hide her. Ten years later, she returns to marry a man and give him the power of the Ring King. When Satou follows her, she bestows the power on him instead.

She developed feelings for Satou during their life together and was sad to leave him. Originally, she was to marry Marse when he returned to his world. When Satou followed her through the teleportation gate, she was surprised, but very happy that Satou had followed her back to his world. However, she was also sad, as she knew what the trials involved in becoming the King of the Rings.

Hime arrived in Satou's world as a child along with her Grandfather, Hime saw that they had a witness so she made a deal with Satou that if he keeps her little secret about coming from another world, then she would be his best friend, Satou took her hand and accepted the offer. Growing up Hime was bullied and called a freak by other kids due to being different, Satou would always chase off the bullies, Satou and Hime would always go to the Summer Festival and hold hands.

(Source: Tales of Wedding Rings Wiki)