Doushitemo Hametsu Shitakunai Akuyaku Reijou ga Gendai Heiki wo Te ni Shita Kekka ga Kore desu

Astrid von Oldenburg is a four-year-old prodigy with a strong interest in military technology. She is reincarnated into the world of an otome game she played in her previous life, but not as the main character—instead, she is reborn as the villainess. Born into wealth and power with a natural aptitude for magic, she discovers that all possible storylines in the game end in her downfall. To avoid this fate, she decides to use her knowledge to recreate modern weapons. Her goal is to eliminate anyone who threatens her, using overwhelming firepower to change her predetermined outcome.