Jugatsu No Owari Ni, Kimi Dake Ga Inai (STARTS PUBLISHING Bunko) [Light Novel]

[Machine Translation] Yume, a senior in high school, had a recurring dream from long ago. An old shrine, a young man wearing a school uniform, a sad farewell.... It is a realistic and sad dream, just like a memory from a previous life. One day, Souto, who looks exactly like the young man in her dream, comes to her new school. Yume feels that it is her destiny, but suddenly he tells her that "you are destined to die in October. In fact, Souto is a man from the past who has come to prevent Yume's death. Yume feels that her love, which should have only been a dream, is becoming real. However, she realizes that she will not be able to be with him even if she survives or dies.

高二の由芽には、昔から繰り返し見る夢があった。古い神社、学ラン姿の青年、悲しい別れ...。それはまるで前世の記憶のようにリアルで切ない夢。そんなある日、夢の中の青年にそっくりの蒼杜が転校してくる。運命を感じる由芽だったが、「君は十月に死ぬ運命だ」と、突然彼に宣告されてしまう。実は、蒼杜は由芽を死なせないために過去から来た人物だった―。「君のことは俺が守るから」夢の中だけだったはずの恋が本物になっていくのを感じる由芽。けれど、生き延びても死んでも、彼とは結ばれないと知って―。