"It's always been assumed that if Ranma married Akane, he'd take over the Tendou Dojo. But what if that wasn't possible?"
Ranma's off with Nodoka for a while and Akane is bored. She asks Genma to train her. Surprisingly she improves dramatically and gives Ranma a tough time in a sparring match on his return. Ranma tries to teach her a technique and fails miserably. Soun teaches Akane a technique, and then she teaches Ranma the technique...