Takumi is a reclusive otaku who wants nothing more than to be left alone to play online games and watch anime. He only attends the minimum necessary to pass his classes, and rarely leaves his cramped room except to purchase the newest figurines. One evening, while Takumi is chatting online with his friend "Grim," a stranger called "Shogun" joins the channel and, after "Grim" leaves, posts a series of disturbing photographs depicting a man impaled to a wall with metal stakes. The following day, Takumi is horrified when he wanders into an alley and once again sees Shogun’s images – but this time, the gruesome scene is reality. From then on, Takumi sees the world through a new set of eyes; imaginary delusions meld with reality, and he isn't sure who he can trust. With suspicions and confusion at every turn, Takumi must struggle to determine what's going on - but most importantly, whose eyes are those eyes?
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...
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.
These stories are very similar in their genres, though the story lines are far apart. If you enjoyed either Gantz or Chaos;Head you'll deffinitely like the other just as much. I'd give more details but that'd ruin the suprise in watching the show, enjoy!
Medusa is a mysterious illness which causes the body to petrify shortly after infection, found throughout the world and steadily increasing the death toll. In order to combat the disease, 160 lottery winners were chosen to be frozen until a cure could be found, one of whom is Kasumi - a twin whose sibling was not one of the chosen. Along with a group of others Kasumi awakens from her cryogenic chamber, but not to the same world she left it: prehistoric monsters roam the now-abandoned castle and eat the survivors, while endless giant thorns rise all around them. Against all odds, Kasumi and the others must now try to survive the horror of their situation and discover the truth behind what's happening, all the while waiting for the Medusa to finally claim their lives...
The reason that these two are similar is a pretty big spoiler for both of these animes, so you're just going to have to trust me on this one. I can tell you that they both have complicated plots that can be confusing at times.
Along with steins;gate, these animes are based off the virtual novels made by 5pb. however i feel that thier are also a lot of similarities between the two main charactors. thier both addicted to a video game and have the same kind of aura about them. its just that the main char of chaos head is insane.
Souma and his friends were typical high school students, and members of the student council; but things changed when a cat girl named Mao appeared in the school, looking for someone named Zero. Souma accidentally breaks Mao's mirror which causes her, Souma and his friends to be transported to her world. In this world, Souma and the other male humans from Earth can wield soulblades drawn from people's hearts. His friends landed in different parts of a war-torn world, so they have subsequently broken up into separate factions and each person is working towards winning the war. His friends have become each other's enemies, and it's up to Souma to be the one to create peace without choosing which friends should die.
in these two anime the main character suddenly gets thrust into a world of terror and deception but over time learn to adapt to this and gains many precious friends over time and are incluenced by their new friends.