Not many people know about this manga because it was written in the 70s and does not even have an English translated version (couldn't find one). However, it is packed full of action and life-or-death romance. The diction I'm using is probably downplaying the absolute awesomeness of this manga LOLL. From what I've heard, it was pretty popular back in the 70s and was even adapted into a very popular TV show in my country.
I don't usually fall in love with female characters, but Ai Saotome is definitely someone you would love and admire, especially starting from the end of chapter 2 (spoiler?). It is often said that the girl in Fruits Basket is really pure and lovely. So imagine Ai as someone like her, but much much stronger mentally.
Makoto is awesome as well, always showing up at the right time haha.
Don't watch the movie. It is nothing compared to how good the manga is.
I really hope someone would translate this into English so more people could see the beauty that is this manga. (if no one would, i probably would)
MUST READ. IT'S MIND-BLOWING.