The Summer Hikaru Died S01E04 - Summer Festival

Yoshiki enjoys a summer festival with his younger sister, Kaoru, who's excited to wear a yukata, and Hikaru. While eating shaved ice, Hikaru casually comments, "Just changing the color of the syrup makes it seem like it tastes different," which leads him to wonder, "If something looks the same, does it feel the same too?" He then asks Yoshiki how he figured out he wasn't the real Hikaru...