Hikaru ga Shinda Natsu is a psychological horror and drama manga series that follows the unsettling story of two boys in a rural village, where one of them, Hikaru, begins to act strangely after a mysterious incident. The narrative explores themes of identity, friendship, and the unknown, creating a chilling atmosphere as secrets about Hikaru's true nature slowly unravel. The series is known for its suspenseful storytelling and haunting artwork.