The Summer Hikaru Died manga volume 6 features story and art by Mokumokuren.

Just as “Hikaru” prepares to return to the mountain, Tanaka appears before him and Yoshiki, bringing with him a harsh truth about “Hikaru's” identity. While the two boys grapple with this new revelation and their paths going forward, the cause of all the chaos—the “hole” linked to the other side—steadily grows. To investigate this strange phenomenon, Yoshiki and “Hikaru” make their way to Maki's hometown, Ashidori, where more secrets lie buried…