Tensei Shimashita, Noukin Seijo desu

Angela is reincarnated into the world of an action-based otome game. However, of the two main characters, she is not the frontline female knight she was so fond of in her previous life, but instead the rearguard saint!? It would be boring if she was reincarnated but couldn't fight with weapons. So Angela, who is a muscle-brained girl, had an idea. Why not just cast a strengthening spell on herself? Angela immediately devotes herself to studying magic and doing muscle training, and stands up. Not to fall in love with the capture targets... but to wreak havoc on the battlefield! The long-awaited comic adaptation of this thrilling reincarnation fantasy with no rules!

(Source: AlphaPolis, translated)