Yoko was born in Littner village. Later on, she would meet up with Simon and Kamina while fighting the Gunmen attacking Simon and Kamina's village, Giha Village. Afterward, she travels with them and their Gunmen to help fight the evil Spiral King. In the anime, Simon makes advances towards her which are ignored as she is developing feelings for Kamina which are eventually returned. Her main weapon is a sniper rifle which she uses effectively to help take out Gunmen.
After the time jump in the anime she works as a teacher taking the name 'Yomako'. When the Anti-Spirals attack she returns to Kamina City and busts Simon out of jail. She participates in the battles against the Anti-Spirals up to their defeat after which she returns to her island to teach further generations.
The dreams we left behind will open the door!