Kouko Matsumoto

Once a high school clubmate of Miyako, this girl has developed an intense, unsettling obsession with her former peer. While Miyako possesses almost no memory of their time together, the former classmate has transitioned into a dedicated stalker, driven by an all-consuming fixation. Her behavior borders on the predatory as she relentlessly pursues Miyako, turning their shared past into a source of modern-day psychological tension and persistent, unwanted observation.