Hikaru ga Shinda Natsu

The Summer Hikaru Died is set in a quiet mountain village where Yoshiki Tsujinaka is still living with the loss of his best friend, Hikaru Indou. When Hikaru disappears into the mountains and later returns, Yoshiki realizes almost at once that the boy beside him is not truly the same person. He has Hikaru's face, Hikaru's memories, and Hikaru's familiar place in the village, but something unsettling and inhuman clings to him, as if the summer air itself were carrying back something that should have stayed buried. Bound together by grief, loneliness, and a secret that could shatter the fragile peace of their small town, Yoshiki and Hikaru move through humid afternoons and tense, half-spoken conversations while the presence from the mountains settles into everyday life. The closer Yoshiki gets, the harder it becomes to tell whether he is protecting Hikaru, denying the truth, or willingly stepping into danger just to keep him near. The Summer Hikaru Died turns that intimacy into a slow, suffocating dread, building a supernatural horror story around affection, dependence, and the fear of what remains when someone you love comes back wrong.