Hakkou na Koushaku Reijou (Byoujaku) ni, Nokori no Jinsei wo Takusaremashite: Zense ga Kinniku Mojo nanode, Oujisama no Kyuuai ni wa Kizukemasen!?

Kureha was once a formidable, muscle-obsessed office worker, but after reincarnating in another world, she finds herself inhabiting the frail body of a duke's sickly daughter. Still adjusting to her delicate new physique and bewildered by the constant doting of her overprotective brother Theobald, she struggles to reconcile her past life with her present reality. Unable to remain confined under her brother's watchful eye, Kureha seizes an opportunity to sneak out and explore the town on her own. Her quiet excursion takes a sharp turn when she witnesses a group of rough-looking men cornering a defenseless woman. Driven by an unshakable sense of justice that transcends her reincarnation, Kureha steps forward to confront the thugs without hesitation. Her unexpected display of prowess catches the attention of Isaac, a prince from a neighboring kingdom who happens to be passing by. After witnessing the outcome of the skirmish, the two end up sharing a secret, setting the stage for an unlikely connection between the oblivious former powerhouse and the intrigued royal.