So back to Sayonara no Tsubasa - the ending changes things by very explicitly having Alto turn down Ranka and tell Sheryl he loves her. But it does so during an homage to Macross Zero that seems tragic, until you really think about it for a while. Alto flies away with the Vajra right before all the dimensional canon blasts hit. Sheryl falls into a coma because Ranka doesn't magically move the Vajra infection from her brain down to her gut where it belongs during the final battle. But what does happen is a more vague, semi-open to interpretation coda. Ranka gives a monologue over a series of scenes a month after the final battle. Ranka gives Sheryl a blood transfusion, sings a song in front of Alto's downed YF-29, cut to credits. That's the end, right?