Hikaru ga Shinda Natsu

In a secluded rural village, lifelong friends Yoshiki and Hikaru share an unbreakable bond. Their peaceful existence shatters when Hikaru returns from the mountains one day, fundamentally changed. Something has taken his place—an entity wearing his face, memories, and emotions.

Yoshiki is thrust into a terrifying mystery as he struggles to understand what happened to his friend. The anime masterfully blends creeping horror with a poignant exploration of friendship, identity, and the unsettling unknown that can lurk within the most familiar places.