The name of the novel is sci-fi mecha. There's a chapter in the middle of it that seems to be about the female protagonist's leg breaking and she needs to go to the medical room to recover her leg.

At the door, it seemed that he was blocked by the wife of a shareholder of the hospital. The officer who accompanied her to save her son broke her son's leg with a shot. After that, the dialogue between the female and male lead was made into a poster by the military to recruit soldiers. I remember that the theme was for love. The poster described that the female lead was doing rehabilitation training under the guidance of the doctor. The leg was painted a little illusory. The male lead was eating in the mech.
I remember that in the novel, the mech came out later. At the beginning, there was no mech. The first one was an old mech that the male protagonist had developed before. He solved the power system of that mech before he could use it. After that, the Empire seemed to only let the male protagonist form a team to see the ability of the mecha team before deciding whether to form an army.

Answer 1

This novel was called " Mecha Warrior: Interstellar Traversing ".

The female lead was Avina, a mecha warrior. During a mission, her leg was broken and she was sent to the infirmary to recover. In the infirmary, she met other mecha warriors and fought with them, eventually becoming a powerful mecha warrior.