I would not have come across this if a friend hadn't recommended it. Seems like an example of a perfectly good manga that's flying way under readers' radar, despite winning at least one award(!).
@UltimaOmega777 I don't know about all of them, but it does mean that Devolution is a prequel to the main Getter Robo storyline, the latter taking place in the new universe.
The translation staff didn't seem to like the ending, but I thought it was perfectly in-character for Eita, a guy who's had a hard time communicating his feelings from the very first chapter, to reply as he did.