The first half plays like a mystery box designed to confuse you on purpose. The second half reveals it was never about solving the mystery, it was about understanding why Ayato keeps forgetting who he is, and what Tokyo costs him every time he remembers. Most shows that pull this move feel clever; RahXephon feels cruel, because you realize the real weapon isn't the Dolem, it's the forgetting itself. The ending doesn't explain everything, and it doesn't need to. What it does is answer the only question that actually mattered: does love survive when memory doesn't?

High school student Ayato Kamina sees his ordinary life collapse when futuristic fighter jets suddenly attack Tokyo and a giant humanoid weapon drives them back. When government agents come after him, a woman named Haruka steps in. She says she was sent by an organization called TERRA and reveals that Tokyo has been sealed inside a time bubble, where time passes at one third the speed of the outside world. Behind the barrier are the Mulians, blue-blooded humanoids from another dimension. Overwhelmed, Ayato runs and meets his classmate Reika, who leads him to an enormous egg. When she begins to sing, a hidden power wakes inside him and links him to RahXephon, a being that bursts out of the egg. Pulled between TERRA and the Mulians, Ayato starts to question his purpose as altered memories cast doubt on who he really is.