Poor Juri-sempai. Shiori's treatment of Arisugawa Juri is why nearly the entire Utena fan community hates Shiori. Even while they were friends, Shiori was jealous of Juri. When she steals the boy off Juri, it's because she can possess something Juri had. When she finds Juri's locket, she feels that she has power over Juri, and seems to genuinely enjoy it.