Over a century ago, mankind was devoured by giant beings of unknown intelligence and origin known as Titans – creatures that eat humans alive indiscriminately and for no apparent reason. The remaining population has managed to survive the last hundred years only by building a multi-walled city capable of keeping the Titans at bay, training military recruits to patrol the perimeter and gather intelligence about their mysterious foe. Eren and Mikasa have lived a relatively peaceful life behind the city's walls, but when a massive Titan appears, smashing the outer barrier and unleashing a wave of terror, their lives are brutally changed forever...
When the infected approached Rei and Takashi's school, it led to a gruesome blood bath that left the majority of students and staff dead or turned into the zombie-like monsters that have spread throughout the world. Together with a handful of other survivors, Rei and Takashi set forth to find their families in a world that is rapidly detoriating. Governments have collapsed, the killer disease is out of control, and people everywhere are trying their best to simply live through each day...
Attack on Titan and HSotD are both shows about humans battling creatures who eat humans for the survival of greater humanity. HSotD is set in urban/contemporary Japan and contains a lot of ecchi, while Attack on Titan is medieval sans ecchi, but both have a gritty & realistic atmosphere.
It's the same in a sense where human kind is trying to survive a type of apocalypse. It also both states how a normal human would react in a time of crisis instead of how people say they'll react.
It's all about survival in both of the anime. The enemies of humans are similar and equally vicious. While Attack on Titan is dark and intense, events in Highschool of the Dead are taking place in a much lighter atmosphere that is spiced up with a bit of humor. That's where they differ, but overall I think that both of them are worth the watch.
22-year-old Ryouta is an unemployed good-for-nothing who spends his days living at home and playing Btooom, a wildly popular online game that's sold over three million copies worldwide. Alongside other teammates, Ryouta battles it out with others using powerful bombs and sonar that can reveal hidden enemies, and his dedication has earned him the title of Japan's top player. But soon, Ryouta's pastime becomes a terrifying reality, as he and many others are dropped onto a tropical island and forced to play Btooom – but this time for real. Now, he and the rest must fight to the death by whatever means necessary, as the only way to win this deadly game is by killing seven of the other players.
Both anime are really bloody and really focus on the phycologial parts of people's actions. Filled with action and strategizing that is close to the feeling you get when you watch code geass.
Both of these shows focus on the despiration and need for survival both portray in their situations. Where one is about being stranded on a island forced to kill one another, the other focuses on the despiration on not wanting to be eaten by the Titans. The survival aspects are key with both.
An akuma is a soul which has been brought back to life through sadness and despair with the powers of Millenium Earl. Their mission is to terrorize the earth and all who dwell within it. The Black Order is a group of Exorcists that have sworn to cleanse the souls of the akuma, and collect the substance known as "innocence". This powerful substance can be used as an anti-akuma weapon, and ultimately can help destroy the evil Millenium Earl. Allen Walker is a young Exorcist who has the ability to tell who is human and who is an akuma with the help of his cursed eye. Together with the Black Order, Allen must find all 109 pieces of innocence to protect the world and defeat Earl.
Both of these series gives us the sense that they are fighting a losing battle. In D. Gray-Man, there is only a small, limited amount of exorcists but an increasing amount of akuma, while in Attack on Titan, humanity's population and land keep decreasing and they keep advancing. We are kept on edge all the time, and small victories seem thwarted by larger losses.
Both of them have a similar theme of young men istruggling with their pasts and the powers they control, joining military organisiations, and fighting for mankind against a common enemy.
For Kouta and Yuka, finding the bloody naked young girl on the beach would change their lives forever, for better or for worse. Unable to speak or function as a normal human being, she is named Nyu by the duo, and taken into their home in an effort to save her. But what neither teenager knows is that this innocent young girl is actually a killing machine -- an experiment gone terribly wrong -- and it is only a matter of time before the murderer in her awakens again...
even though the stories in both animes are totally different, there's this same atmosphere in both, they both contain a lot of gore, blood, flying limbs, etc. and even though the stories are different, they are both really exciting
the characters aren't alike at all either, but that just makes it better, they're not alike, but they do share some things, so that if you like one, you'll also like the other one
Like above, the gore and brutality bring these two together, but also both draw the viewer in to the world. Both are tragic, and you'll probably be crying and flailing in either one. I wouldn't watch the two back to back, that's for sure.
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?
People trapped underground = locked behind the walls of the people. Cut off from the world by a huge creatures.
Both Gurren Lagann and Attack on Titan deal with themes of humanity facing an iminant crisis of extinction against a vastly more powerful foe, usually in the form of a giant. The action scenes are frenetic, with lush animation that portrays a grand sense of scale, motion, and tense energy--almost knocking you from your seat with their extreme velocity! Characters often overcome obsticals through sheer force of will and determination, and a little help from their loyal friends. Pulsing rock music and an undeniably unique sense of style punctuate both series, making for a viewing experience which makes you want to leap into the fray alongside your favorite characters. Expect a rollercoaster ride of emotions and one thrilling scene after the next!