Much to the annoyance of Kei, he and his childhood friend Katou have died, having been torn apart by a train. But rather than finding themselves at the gates of heaven, the duo materialize in a room full of strangers and a giant black sphere known as GANTZ. As if dying once wasn’t bad enough, the occupants of the room are then forced to embark on dangerous missions to kill strange aliens; missions that very few return from. Now, Kei, Katou, and a well-endowed friend must fight for their freedom with an arsenal of guns, high powered suits, and a very low chance of survival.
While investigating the site of a strange explosion with his friend Tetsuro, Sho Fukamachi stumbled upon a mysterious artefact – the bio-armor suit called Guyver! Unfortunately, the owners of the artefact – a shadowy organization called Chronos Corporation – want it back; and they want to ensure that no one lives to tell of its existence. To survive, Sho must unlock the increasingly fearsome powers of the Guyver suit while battling an endless stream of Chronos' bio-engineered monsters. His journey will lead him to the truth behind not only the origins of the artefact, but also of mankind itself!
Although there are some differences visually, these animes are actually quite similar. The main characters are forced into a world where they must fight for their lives. In most cases they are aided by enhanced suits and weaponry. The protagonists are similar in the way that they hated how this was pushed upon them with no other choice and try to find a way to cope with it, and still live their lives.
In present day England, a war is being fought. The average citizen does not notice, but vampires are running rampant among the populace, and it's up to the Hellsing organization to contain the bloodsucker threat, using even their own weapons against them. Alucard, a vampire himself, is the best agent the organization has to offer, answering only to Integra Hellsing herself. No one knows much about this mysterious figure fighting against the occult, but things starts to change after he “recruits” a new agent to the establishment...
Alucard is a vampire who works for Hellsing – an organization responsible for hunting down and destroying other vampires. In these dark times, whoever is bitten by a vampire turns into a ghoul -- with the exception of Seras Victoria, Alucard’s newly created and appointed apprentice. Now, Seras must serve her master, Alucard and work for Integra Wingates Hellsing. Nefarious vampire activities are being reported throughout England, and it all traces back to the organization named “Millennium”. Will the Hellsing organization, under the command of Sir Integra Wingates Hellsing, be able to prevent a full scale war? Or will the world become a battlefield of destruction?
It is the year 1983; and in the village of Hinamizawa, on the night of the cotton drifting festival and in the days following it, a series of deaths occurs. The only hope for the village and its inhabitants is the shrine maiden Furude Rika who, with the help of her invisible partner Hanyuu, is able to travel back in time and alter the events that led to disaster. Unfortunately, regardless of what changes are made, each voyage ultimately ends with the death of Rika and many of her friends. But when Rika’s friends start remembering things that happened to them in previous worlds and take steps to avoid the same outcomes, Rika realizes that their chances of survival have never been better. Can she really challenge and defeat fate itself?
Both of these animes have quite high doses of horror and gore in them (though more Gantz than Higurashi Kai) However they also both focus more on the intellectual and psychological aspects of things like murder and death, messing with your mind more than plain horror titles.
Thor and Rai are twins who live on an advanced space colony called ‘Juno’. Things take a nasty turn one day when they are kidnapped by the Federal Army’s Special Forces and abandoned on the hostile prison planet Chimera. A cycle on Chimera consists of 181 days of scorching heat and 181 nights of below-freezing temperatures – not to mention it is populated almost entirely by carnivorous plants. The convicts on Chimera have found only one means of survival – reverting back to the law of beasts. For the strong-willed Thor adjustment comes naturally; but for his naive and weaker brother Rai, things do not go as well. Thor must now use all his wits, strength and courage to endure life as a member of Chimeran society, rise above the rest, and take the only ticket off this planet: becoming the Beast King.
If you liked the theme of 'survival of the fittest' then you would love Gantz and Jyu Oh Sei. While Gantz is definitely more graphic and grotesque it also stands to try to define a bit of society and how values work. Jyu Oh Sei also plays on morals and the like but on a much smaller level. It isn't nearly as gory as Gantz.