Aka to Hairo No Sacrifice It's Going to Take Some Time (Media Works Bunko) [Light Novel]

[Machine Translation] Jade Island is a remote island in the Honshinetsu region. On this small island suffering from depopulation, a violent incident suddenly occurs. One after another, prominent buildings are burned to the ground, and in the end, people die. The only family member killed is Noah, a young boy whom everyone had longed to meet. Ten years have passed since he lost his father and left the island without saying goodbye to even his best friend. When they turn 25 years old, Noah appears before Masho and Orihime, who have lost touch with him for a long time. Their reunion uncovers the gruesome truth of the incident. A red flame of sorrow consumes this romantic mystery for a new age.

北信越地方に浮かぶ離島、翡翠島。過疎に悩む小さな島で、突如、凶悪事件が発生した。次々に著名な建造物が燃やされ、最後には死者まで出てしまう。殺されたのは、誰もが憧れていた少年『ノア』のたった一人の家族だった。父を亡くし、親友にさえ別れを告げずに彼が島を去って十年。二十五歳になった真翔と織姫の前に、長く音信不通だったノアが現れる。三人の再会は、やがて事件の陰惨な真実を暴いていく...。哀切の赤い炎が焼き尽くす、新時代の恋愛ミステリー。