In a dark future, the world is in ruin and everything is slowly crumbling away into dust. Humanity is almost extinct, while robots desperately seek out new parts to replace their rusting bodies. Their only hope for survival is to devour the one known as Casshern… or so they believe. Meanwhile, Casshern himself has lost all memory of his past. Why are these robots attacking him? Did he really kill the one known as Luna; the Sun that was called Moon? And why is he, alone, unaffected and undamaged by the ruin?
Welcome to a world in which memories can be transferred from body to body; old painful memories can be removed and replaced with new ones, and the poor sell their bodies to the rich to survive. Waking up one day, Kaiba finds himself in a strange place with no memories of his past and a mysterious hole in his chest; the only clue as to his identity is a locket with a picture of a girl hanging from his neck. Armed with this token, Kaiba must now travel across the galaxy to discover who he is and what the girl in the locket means to him; however, his journey will bring him into contact with many people whose lives have been tragically affected by the manipulation of memories. All too soon it becomes clear that something is very wrong with this world…
Both Kaiba and Casshern Sins use an old anime style (60s, 70s) renewed as a fantastic and artistic animation. Both have a great ambiance reinforced by great and original music.
The share a similar structure: Both series begin slowly with the characters exploring many places and trying to answer questions about themselves. They encounter people in way like Kino's Journey. After, in the middle of the series, it begins to be more in the center of the plot with many questions answered and the episodes become less episodic.
Watching both Kaiba and Casshern Sins, I felt many emotions and was very impressed by their artistic value.
If you really liked where Casshern Sins was going with its narrative concept but thougth it kinda fell down with its execution, then feast on Kaiba. It's a wonderfully tragic dystopia that's decaying, albeit in a wholly different manner. The animation concept is also equal to, if not quirkier, than Casshern Sins. The main difference is that it lacks the shounen action to make it more conventionally appealing. Kaiba, in a philosophical and stylistic sense, is Casshern Sins' more mature and more charismatic sibling. Definitely check it out.
Kamina Ayato may seem like an average boy in a devastated world, but after being captured by TERRA, a military organization set on saving the world from the Mu, an alien race set on "tuning" the world, he realizes he is an instrument in deciding the fate of humanity and piloting RahXephon. Not only is Ayato the only person who can control the mecha, but he also has a terrible fate of his own. Holding onto memories of his old life and grasping to keep his own humanity, he must struggle in this new world and realize his true potential with RahXephon.
Casshern Sins wants to combine pretentious mindfuckery with an inspiration drawn from a goofy seventies Saturday morning cartoon; hinging the whole affair on some rather bland characters - with rather dry and uncompelling action sequences. I found the results to be less than ideal.
However if that was your cup of tea or you wanted it to be, RahXephon is basically more of the same, only better.
Two siblings, Keiko and Tatsuya, live in a future reshaped by a terrorist attack known only as "Twin X". In this terrible new world, advanced technology such as computers and radios no longer function and even the very sky has become something terrifyingly alien. With the siblings' mother dead, they are hunted by loan sharks who want recompense for her debt as well as a mysterious Countess who wants them for her own reasons. Even worse, they are also coveted by their father, the terrorist who caused the "Twin X", Gilgamesh!
Honestly this shouldn't be a surprise to anyone. Both have an extreme and heavy atmosphere to their plots. These anime also have bold and defining artstyles, and also some very interesting music to go along with them.
In another world, there exist many countries, each with different cultures, customs, and traditions. From technological marvels to folk legends, each location yields a vast wealth of insight of its people: their hopes and their dreams, their failures and fears. Kino is a traveler whose goal is to visit as many new places as possible, learning about others' ways of life, but also making sure to stay clear of their affairs. Together with the talking motorrad Hermes, Kino sets out to explore the beautiful world and meet its inhabitants, wherever they may be.
Like in Casshern Sins, Kino no Tabi consists predominantly of a central character exploring a world and learning as she goes along. Kino no Tabi, however, is gentler, more thought provoking, but not as style-oriented. If your favourite moments where the ones where Casshern met inddividuals, learning from them about the joys of life and death, then Kino no Tabi will be a perfect follow-up.
Simon lives a boring life in the underground village of Jeeha, where his main job day in and day out is to dig tunnels. His close friend Kamina, however, longs to bust out of their oppressive existence and reach the surface world where open skies and adventure await! One day, during his usual digs, Simon discovers a robot with a big face buried amongst the rocks. No sooner has he shown Kamina his mysterious find when two beings from the surface crash land into Jeeha Village - one is a gun-toting woman calling herself Yoko and the other is a terrifying mecha piloted by a Beastman! Seeing their chance to escape village drudgery, Kamina rallies Simon and Yoko to defeat the invader using their new robot, Lagann. However, upon breaking out onto the surface world, Simon, Kamina, and Yoko encounter enemies more powerful than they could have envisioned. Their fight for adventure just turned into a war for the survival of the human race - will their lust for freedom hold out against such terrible odds?
Assuming you loved the shounen action and gorgeous stylish animation, the zany 70s concept, I highly recomment Tengen Toppa Gurren-Lagann. One thing to note is that Gurren-Lagann is far crazier, more spastic, but also has a more powerful story that is gripping from beginning to end. Gurren-Lagann, like Casshern Sins, has style by the bucket-load, and its shounen approach is far more brazen. Worth checking out if you want to keep the style and action of Casshern but want to discard the episodic philosophising.