"I can't believe that tree was foreshadowing..." The shocking ending involving best friend Hikaru leaves the internet in uproar. Episode 4 of Anime "The Summer Hikaru Died"

"The Summer Hikaru Died" is based on the popular manga by Mokumokuren, which has sold over 3.5 million copies. The story is a coming-of-age horror revolving around Yoshiki, a high school boy, and the “Something” that has taken the form of his best friend Hikaru.

Episode 4 “Summer Festival”
[Synopsis]
Yoshiki enjoys the summer festival with his friend Hikaru and his younger sister Kaoru, who wishes to wear a yukata. While eating shaved ice, Hikaru brings up how he seems to taste a difference in flavor just from different colorings, sparking the question, “If something looks the same, does it really feel the same?” He then asks Yoshiki how he was able to figure out that he was not the real Hikaru…

(C)Mokumokuren/KADOKAWA/The Summer Hikaru Died Partners