This show has great action direction. I mention that up front because this 4-episode OAV series is almost 100% action scenes. It never pauses for breath. In some shows that would be exhausting or tedious, but for an old-school super robot story it works just fine. As with seemingly every Getter series, it assumes familarity with other shows in the franchise, but the proceedings are so simple that it doesn't matter if you don't know these characters. There's really nothing you could call a plot here, just: bad guys show up, so fight, fight, fight. Fortunately, the fight, fight,fighting is entertaining from beginning to end, packed with high energy and back by a rousing score, so that's really all it needs. Getter Robo Armageddon was a better series overall, but that had 13 episodes to work with, so it had time to build a real story. If you just want a quick, sharp shot of giant robot action straight into your veins, this one does the trick.