If you're looking for manga similar to Ranma 1/2 OVA, you might like these titles.
Two Brothers are climbing a mountain to learn a secret fighting technique from an old man. Three years later they are returning to their village ...
In a world where traditional warfare has been replaced by proxy battles fought by extremely powerful, and extremely LARGE, individual representatives chosen from each country, one rookie warrior faces her introduction to the international stage.
After his father's dojo gets crushed by a man, a boy named Raichi aims to become the strongest fighter. Years later after becoming the champion, he still isn't satisfied. He finds an underground fighting ring where fighters have special abilities. The underground champion is the man who crushed the dojo! However Raichi gets defeated before he could even face him. A strange creature offers Raichi the ability to heal wounds so he can fight against those special humans. It worked ... but he's been turned into a girl too!
Tamasaburou has finally gotten up the courage to ask out Kanako, and to his surprise she said yes! But then a freak accident happens and he takes the classic injury to the groin. However, because this is a manga, you can expect something strange to have happened. Sure enough, Tamasaburou’s accident has turned him into a girl! So now what can he do?