It was announced that Mokumokuren’s The Summer Hikaru Died manga is receiving a television anime adaptation! As of now, no details are known about staff, studio, or the release date; however, a celebratory illustration was released via Twitter which you can check out below:
Yen Press is currently publishing the manga and describes The Summer Hikaru Died as follows:
It has Hikaru’s face. It has Hikaru’s voice. It even has Hikaru’s memories. But whatever came down from the mountains six months ago isn’t Yoshiki’s best friend. Whatever it is, it’s dangerous. Carrying on at school and hanging out as if nothing has changed—as if Hikaru isn’t gone—would be crazy…but when it looks so very like Hikaru…and acts so very like Hikaru…
Source: Crunchyroll