Why is Kurumi obsessed with Shido?

Could you please elaborate on the reasons behind Kurumi's obsession with Shido? Is it purely romantic feelings, or are there deeper motivations at play? What specific qualities or characteristics does Shido possess that have captured Kurumi's attention and affection? Additionally, how does this obsession impact their relationship and the story as a whole? I'm particularly interested in understanding the psychology behind Kurumi's feelings and the dynamics of their interactions.