Olivia North discovers her sensitivity when she encounters a tomodari on top of the college's chemistry department building, blaring club music. She uses the emitted sounds to track its partner to a nightclub rooftop, and shortly after, becomes transfixed by the strangers' scientific implications.
Unable to be taken seriously by the scientific community, Olivia turns to the internet to collect more data and meet other sensitives. Shortly afterwards, she moves to North Mural, where she finds employment as a research scientist for pharmaceuticals. She continues to study strangers in her personal time in the hopes of creating a permanent hormone replacement – something she would have thought impossible before discovering the strangers.