I know I've seen the show with the couple below the Gundam. I can't remember the name of it. the only scene I can remember is them spending a while hyping up a guy that fought with a calligraphy brush who then proceeded to get owned by the bad guy's henchman (who I can remember nothing about). This was not an important scene and was like 20 episodes in but it stuck with me. I remember at the beginning the woman teaches the man martial arts and then they fall in love and then the man goes out into the world to do stuff, and I don't remember why the woman didn't go as well but I remember being annoyed by her staying behind. It is roughly 17 years old.