Juro discovers that the dreams he keeps having is Juro Izumi's memories, but not the Juro Izumi he was before memory loss, but the Juro Izumi from two loops ago. The one who's known as 426, the mass murderer.
Juro's best friend, Shiba Kyuta who's another version of 426 that only he can see, has been manipulating his memories. Though it's revealed near the end that Shiba was actually saving him. The memories were already implanted into him by the time Shiba comes into the picture. Shiba converted the memories that Chihiro Morimura planted into him into movies. If Shiba didn't, the clash between Izumi's memories, and Kurabe's personality would've broken him.
