Hikaru Mikage is one of the central characters in the manga series 'Hikaru ga Shinda Natsu' (The Summer Hikaru Died). Hikaru is a high school student living in a rural town and is the childhood friend of Yoshiki. After a mysterious event in the mountains, Hikaru's personality and mannerisms change, leading Yoshiki to suspect that his friend has been replaced by something inhuman. Hikaru's ambiguous identity and eerie presence drive the suspense and emotional tension that define the series.