Toko is the daughter of Takuma Zaizen, Administrator of the STN-J. But they have different last names, because Toko has gotten married before. She has also been in a relationship with Amon, who ended it however. Robin becomes Toko's roommate when she is transported to Japan to join STN-J. While roommates, Toko however does not want Robin to use her craft there. This is noted when Robin accidently lights the stoves flames back on with her craft.