It all began on the night of Erica's fourteenth birthday. The ruthless Imperial Army launched a brutal assault led by an enigmatic armored man, killing the citizens of her kingdom. To compound the tragedy, the Armored Man took the life of the person Erica loved most in this world—her mother—right before her eyes. What should've been a joyous celebration turned into a nightmare, leaving Erica to grapple with the heart-wrenching loss of her mother, friends, and the familiar world she once knew. Ever since that day, Erica has vowed to avenge their deaths and kill the Armored Man. She finds solace in Raoul, a young man she meets by coincidence. As their bond deepens, Erica remains blissfully unaware that Raoul conceals a dark secret—he is the very Armored Man she seeks to destroy. This gripping tale unravels the intertwining destinies of Erica and Raoul as they navigate the tumultuous journey of growth and hardship. Will vengeance tear them apart, or will it be the force that binds them together in an unexpected twist of fate? 14歳になったエリカの誕生パーティーの夜、全てが始まった。 「鎧の男」率いる帝国軍に襲撃されて国民たちが次々と殺された挙句、 この世で最も愛する母さえもエリカの目の前で「鎧の男」によって命を奪われる。 たった1人残されたエリカは 帝国の侍従長に連れられて城の奴隷になれ果てる。 辛い生活の中で鎧の男への復讐を誓うエリカの前に1人の少年が現れるが…!? 2人の悲劇的な運命はどんな結末を迎えるのだろうか——。