Due to advancement in clone technology, mankind had finally obtained eternal life.

Arcadia, the ultimate life regeneration system. Through it, the frail mortal human received salvation from absolute death… Or so it was meant to be.

For some reason, the implantation of memories into duplicated bodies were only successful in the case of teenagers.

With the onset of war, this defect meant the deployment of these undying children to the frontlines.

Ichinose Akito was one of them, a second lieutenant in the United States of Elmea Army. As penalty for his militaristic underperformance, the platoon he led was ordered to undertake a salvage operation for top secret information with a survival rate of virtually zero.

In the midst of a sudden enemy encounter, Akito covered his teammates from a crustal collapse and found himself face-to-face with his arch-enemy: Philia Loadrain of the Lorelia Federation. To make things worse, they were cut off from the surface and the ability to respawn.

The two of them with opposing personalities and skillsets must put aside their differences as they make their way up the surface—.

記憶のデータ化と高度なクローン技術が結集した究極の生命再生システム《アルカディア》。
その恩恵で《死》を超越した少年少女の兵士たちは、戦場で日々戦績を競い合い《死に続ける》。
そんな中、エルメア合衆国軍少尉・一之瀬秋人が率いる小隊は戦績不振のペナルティとして、全滅必至の機密情報回収作戦へと投じられる。
予期せぬ戦闘と地盤崩落により、秋人は因縁の宿敵,、ローレリア連邦軍のエリート少女フィリア・ロードレインとともに《アルカディア》に接続不能な地下深くで孤立することになる──！！

第28回電撃小説大賞《金賞》受賞作、堂々のコミカライズ！！！