The Summer Hikaru Died, Vol. 2 (light novel)

Yoshiki notices that his best friend Hikaru Indou has been replaced by a mysterious, unsettling copy, yet he remains close to him despite growing concerns. As Hikaru’s behavior becomes increasingly alarming, Yoshiki faces difficult choices to uncover the truth. Concurrently, a man named Tanaka investigates strange happenings linked to an eldritch being, drawing him closer to Yoshiki and Hikaru.