HIKARU GA SHINDA NATSU VOL.1-12 END

STORY : 

Best friends Yoshiki and Hikaru have been stuck together like glue for most of their lives. Living in a small village and being the only children their age, the two boys find solace in each other's company. Their friendship seems picturesque at first glance, but Yoshiki has noticed a shift in Hikaru's demeanor ever since one fateful summer.
The "Hikaru" that sits beside him now is nothing like his friend. Despite his physical appearance and memories remaining exactly the same, Yoshiki knows something is amiss and that the Hikaru he once knew is gone. When he brings this up, Hikaru partially transforms into an otherworldly being, threatening to kill Yoshiki if he cannot accept it—while also professing its love for him.
Wracked with grief and unable to let go of his best friend, Yoshiki struggles to move on with his life as he finds himself getting closer to the new Hikaru. At the same time, strange occurrences begin to plague their village, bringing unsettling chaos.

佳纪与光是在某个村落从小一起长大的同龄玩伴。烈日灼烤大地，蝉鸣萦绕耳畔。在回家路上吃着冰棒，聊着琐事相视而笑。就在这个一如既往的夏日里——“……你，其实并不是光吧？”半年前，在山里失踪的光竟在一周后突然回来了。尽管声音和相貌都与光别无二致，但在内里蠕动的却是——“光已经不在了啊……既然如此……”尽管佳纪开始与拥有友人相貌的“某物”共处，继续着“一如既往”的日常生活，但与此同时，却有离奇事件接连侵袭村落。向着未知的“某物”不断堕落的青春恐怖故事，于此揭幕——