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在北海道的某個平凡小鎮，有一對天真的高中生戀人——修二與千瀨。兩人會在一起，是因為千瀨鼓起了勇氣向修二告白，並且在交往之後，兩人才開始互相深入認識彼此。但好景不長，雖然小鎮一片和樂，不過世界的其他地方都已經充滿戰火。為了抵抗敵軍，千瀨被軍方選中，化身成為最終兵器。她一方面必須負責保護日本，一方面還努力地保持和修二的戀愛關係。她利用交換日記的方式來和修二維繫感情，在日記裡，千瀨透露出自己的脆弱和無奈……
高橋真超浪漫、唯美的SF愛情故事。相信無論男女讀者都會感動得痛哭流涕，無法自拔地愛上它！不需硬將銷售對象鎖定為男讀者，是部可以男女通吃的佳作。
Shuji and Chise are high school seniors in a small town who have just started dating, when Shuji discovers that Chise has been engineered by the SDF so that she can transform herself into a powerful weapon. While Shuji and Chise keep trying to nurture their relationship, Chise continues to grow even more powerful as the Ultimate Weapon, and becomes increasingly torn between being a destructive fighting force and remaining an ordinary teenager. What do you do when the girl you love becomes a weapon of mass destruction?
