Erika met Juri when they passed the entrance exam for their high school. Erika saw Juri yelling she passed the exam. At that moment, Erika did not talk to her but she thought that Juri was quite an energetic girl and that it would be great if she was accepted.
Since they are in the same class in high school, Erika, Juri and Yukko became best friends.
Sometimes, Juri shows she's a bit jealous of the relation Erika and Yukko have, because they knew each other before knowing her.
Juri likes to tease Tooru, calling him a "prince" because of his popularity in high school, his behaviour and the role he first got in White Snow. Juri knows how to annoy him. She takes many notes of his behaviour because, according to her, this is the way he is so popular with girls.
Tooru cannot bear Juri at the beginning, because he does not like to be called a "prince".
This moment, they are often seen together, everytime fighting but Tooru smiles more with Juri than with the others.