Rahxephon is a masterpiece. It has one of the smartest and original stories ever written, with characters that are easy to love and hate, depending on their role in the series. To add to that, Rahxephon has a soundtrack that perfectly matches both the mood of every scene, as well as the overall theme of the anime, and since this anime is based off of musical patterns, a good musical score is a must.
But all that wasn't enough for me to give Rahxephon a five. It was actually the final two minutes of the twenty-sixth episode that caused me to give this series a five. While I won't describe it, and therefore spoil it, I'll say that it does everything and then some to fully explain what was actually going on between the two main characters of this series, Ayato and Haruka. To me, it was the perfect ending to a series that had me a bit puzzled until those last minutes, and I actually laughed out loud at the final words that flashed across the screen before it was finally over. So, advance warning, don't turn the final episode off until all the credits have rolled or else you'll miss one of the most important moments in the story.
As for the story, Rahxephon follows a seventeen-year-old boy named Ayato who grows up believing that his small place in Tokyo is all that is left after an apocalypse. Yet this, as he learns quickly, is a lie, and Ayato soon finds himself the key tool in a battle against a race of alien creatures known as the Mu, who appear human in every aspect but their blue blood. Working for a military organization known as Terra, Ayato battles the Mu's Dolem, giant robotic creatures who use sound patterns as weapons, with his own giant robot, the Rahxephon. Along the way, Ayato meets a few friends, as well as experiencing some rather strange occurrences, including an illusionary girl, a few love interests, and a red-haired girl named Quan who seems to know more about Ayato than he does.
Well, that's about the gist of the plot. Rahxephon is actually a difficult anime to explain. I can say that it's somewhat of a love story as well as a tale of apocalypse, with a large cast of characters. But still, I can promise that if ever there was a giant robo anime to come close to the success of Neon Genesis Evangelion, Rahxephon is it. It contains a story as smart as Eva, only a little less confusing. It has excellent animation and a lot of great action. And it has the aforementioned soundtrack, including what may be the best opening credit song to ever grace an anime. Get this if you love giant robo anime, or loved Eva. Also, if you like Studio BONES productions (Fullmetal Alchemist; Wolf's Rain; Eureka Seven), then this is definitely one you'd like to get.