Disclaimer: I don't own either Ranma or Macross. They are both owned by their respective owners.
It was a normal day in at the Tendo Dojo... 'Ranma no baka'... Well as normal as it gets there. It had been 2 months since the failed wedding and the Saffron fiasco. Ranma realized retrospectively that he only won the last fight due to pure luck, and the fact that Saffron was pretty much insane and was not fighting even near his full skill. He realized that he would not have been able to save Akane if Saffron was fighting at even 25% of his full skill. Also, as far as power wen't saffron dwarfed him by over 100 times. Over the last 2 months he had gone into the most intense training regimen since arriving in Nermia. He and ryoga came to an understanding that by training together, they would be able to better protect akane and akari respectively. Finding a deserted area on the outskirts of Tokyo, they had been refining and developing new techniques while also increasing their KI reserves and regeneration rates. Also, they focused on making sure their cursed forms were equally equipped. While, in his male form he worked on increasing his native strength (ie: without KI argumentation), to the point he could now lift over 350 kg without any help from ki, in his female form he increased his speed to the point where he could run at 60 km/h without using any KI. In translation, he could run up to mach 2 when using KI as fast as he could regenerate it. Also, he did Breaking point training in both forms increasing his durability considerably. Finally while his female form was weaker than his male form she still had a native strength of 250 kg, and could run 4 times as fast as his male form. Finally, Ryoga has trained his cursed form to the point that he could defeat pretty much any attacker while in pig form.
Well, back to the fight at hand... Akane had gotten mad at Ranma for refusing to eat her cooking, though as she had a tendency to use items labeled 'poison', his reasons were rather well founded... That said, he eventually ate it cause he was really the only one other than ryoga who could survive her cooking with only minor damage. (Nabiki had been making pretty good profit selling the leftovers to the bio-weaponry department of the JSDF).
However as Akane malleted him for not enjoying her cooking, he mused that it had one use, he was pretty much immune to any poison and no longer effected by Shampoo's love potions that she tended to slip in food she cooked for him. Though in thinking that, he failed to move out of the way and took the full brunt of her mallet. Unfortunately for our intrepid hero, Akane had gotten much stronger over the time Ranma had lived in the Dojo. As a result, our hero got his daily dose of vacuum exposure when he reached 80 km before falling back down.
After getting out of the resulting crater, (with happened to be near his training area), and getting in a small spat with Ryoga for insulting 'The tomboy', he continued his training. Unfortunately for him, as he was heading home, the AFIAR, (Alliance for Idiots against Ranma), Attacked him with their latest plan, an antique amazon banishing scroll, acquired by Agent Duck... aka Moose from Colognes secret stash.
The Idiots, aka, Kuno, Moose, Tsubasa, and Gosunkugi, had been working for ages figuring out how to use the scroll, and they had finally figured how to use it... They had no idea where it would send Ranma, but decided it would get him out of their heads, so they could pursue the girl of their choice... Ranma-chan and Akane for Kuno, Shampoo for Moose, Ukyo for Tsubasa, and Akane (again) for Gosunkugi. And of course no one bothered to tell Kuno know that Ranma and Ranma-chan were the same person, and that by banishing Ranma he would loose Ranma-chan.
So with there fingers crossed they activated the scroll and threw it at the unsuspecting Ranma, sending the poor bloke into the Macross universe during the time of the Frontier.