The final chapter of the manga The Summer Hikaru Died has been posted on the web manga site Young Ace UP, ending its five-year serialization, ORICON NEWS reported on October 20, 2026.
The series began running in Young Ace UP in August 2021. ORICON NEWS describes it as a coming-of-age horror story about Yoshiki, an ordinary high school boy. Yoshiki lives with a mysterious being called "Hikaru" that imitates his childhood friend Hikaru, and he experiences a series of strange incidents around him.
The manga ranked first in the men's category of Takarajimasha's Kono Manga ga Sugoi! 2023 guide. Its TV anime adaptation aired from July to September 2025, and the official anime website has announced that a second season is in production.