Hikaru, a model, had always felt frustrated about constantly being stared at for her legs. One day, on the train home from a photoshoot, she became a victim of molestation, experiencing erotic moments under the gaze of passengers. After that incident, she began feeling unsatisfied with ordinary sex, seeking new pleasures through intimate encounters with her photographer in front of mirrors and participating in threesomes during photo sessions. Hooked on the thrill of being watched, Hikaru spiraled into an irreversible obsession.