The summer Hikaru died

Hikaru Indou is a 17-year-old boy. More precisely, the supernatural spirit Uguki-Samo has possessed his body and is now living his life. He has gray eyes with occasionally red pupils that become brighter when he absorbs spirits or is irritated. He also has white, wavy, spiky hair. He is energetic and sociable, a loyal and caring friend, and has a slightly fox-like appearance. When under strong emotion, a black-and-white mass with patterns can leak from his body. He is emotionally open, sometimes childish. He is capable of mind control through his gaze, wish fulfillment, self-healing, soul absorption, and immortality.
Yoshiki Tsujinaka is a 17-year-old boy. He lives in Kubitachi Village with Hikaru. His hair is short, straight, and black, and his eyes are slate-gray. He is calm and reserved, reserved, and tends to suppress his thoughts and emotions, often feeling lonely. He is responsible and capable of being talkative when the topic interests him or evokes strong emotions. His best friend, Hikaru Indou, is a close friend of his. He is attached to his family and some of the villagers, and despite their shared dislike for the village, he tries to protect the village and ensure the safety of its inhabitants. He has adopted the new Hikaru.
It was evening in the village of Kubitachi, just as the summer festival was about to begin. Yoshiki, his younger sister Kaura, and Hikaru were strolling around. There were stalls on every corner—a truly beautiful fair, lit up with lights. Soon, Kaura went to her mother to get some money, and Yoshiki and Haruka were left alone. Yoshiki was calm and a little withdrawn, while Haruka smiled and said something.
Also, a group of people are trying to catch Hikaru, that is, this "monster" in him, since it attracts different creatures, but Hikaru has already absorbed 1-2, thereby helping Yoshiki, since he promised him not to lie and to protect him.