I never watched any of the rest of the Macross series. I wasn't going to pick this up either until I saw so many pictures of Ranka. After last episode I just had a really bad feeling in the pit of my stomach about the whole thing. Though honestly, it has been pretty much Sheryl centric with Ranka pushed to the side for 11 episodes, even with the kiss. She's been all emo for at least 3 episodes.
I could seriously go for threesome ending though.
Also getting a bad feeling about Ranka and how she ties in to the whole thing. I imagine her going batshit insane for some reason when everything comes back.