Night Head Genesis is a show about people with psychic powers and the origin of that energy. It start with the story of the two brothers and their own problems being accepted in society due to their psychic power, evolves into a story about fighting to save the world from a supposed cataclysm and this unveils an elaborate plot about the world, nature, the growing psychic energy and its two sides, the good and the evil.
The theory is well explained and based on common scientific knowledge with a spiritual touch, the energy of all living things, animal, plants and humans is evolving and granting humans powers, all the wrongdoings of humanity turn this power into negative energy causing catastrophes and ultimately the armaggedon. Of course by doing good, and accepting the powers given to humanity we can evolve together with earth into a brighter future.
The theory is basically this but while the show does a good job explaining it in the last episodes the plot is very flawed, for 20ish episodes you'll follow the story of the brothers fighting against a big corporation who doesn't care for the future of normal humans but suddenly the story ends abruptly without even explaining what happens to most characters.
The last two episodes happen an year and half later and the two brothers again use their powers to prevent another disaster, this episodes are more of a showcase of what would be like if the show didn't end so fast i guess, wasting so many episodes building a complicated plot to end it abruptly greatly damages the show overall and despite the last episodes giving some clues helping to understand the whole story behind the psychic powers the previous 24 episode plot is just unfinished and the little story on the last two would probably be the start of another season. With all said and explained I cant recommend greatly this show despite having great potential, was completely ruined. Its still enjoyable and you do understand more or less what happens at the end, the soundtrack is very good and its not a bad watch if you can bare the sudden shallow ending and not knowing what happens to most secondary characters.