If you liked the Sword Art Online anime, the Anime-Planet community thinks you'd like:
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...
Both animes have great combat scenes. Attack on Titan will really give you alot of HUGE swists in the story. You will NOT be able to predict how Attack of Titan's story goes.
Sword fighting, huge enemies, strange world, capable main character, badass girl fighter, medival(?) theme. If you liked one, you'll definitely ike the other.
In the near future, the outbreak of a terrible disease called the Apocolypse Virus places Japan under the military rule of a global organization called the GHQ - a group tasked with checking the spread of the virus and administering vaccinations. Apathetic high school student Shuu Ouma lives in Tokyo, spending his days editing videos and trying to be left alone. But things change when he meets the beautiful pop idol, Inori, who is on the run from GHQ soldiers. While trying to save her from her captors, he acquires a mysterious power called the Void Gene that allows him to pull items or weapons from anyone under the age of seventeen. Now, Shuu must decide whether to join the efforts of the well-funded radical terrorist group "Funeral Parlor" and fight against the GHQ, or shrug off his newfound power and resume his normal life - assuming that either the GHQ or Funeral Parlor's charismatic leader, Gai, will let him.
Both have main characters that are "normal" people who get caught up in something way bigger than themselves and obtain some form of unearthly power to help them save the world. So what if one of them is in the real world and the other is in a game world? They have a similar style and feel; if you like one...I'm not going to say you'll like the other...but I bet you will.
Both contain a hero who goes on an epic journey that involves self-discovery, love, and awesome fights, and they'll both make you cry if you really get into your anime
Gon and Killua finally have a means of which to enter Greed Island, a game designed just for Hunters. Are their Nen abilities strong enough to help them survive in this new world? They must now train and grow stronger to uncover their secret abilities. With a helping hand from Bisque, they will be able to continue their quest to unravel the mystery behind Gin Freaks and this 'almost too real' hunter game.
Both SAO and HXH greed island Ova are about a boy going inside a video where if you die in the game you die for real.
Both are about younger main characters with incredible fighting potential inside a VR MMO. The mechanics and rules of these worlds are often very different to the reality that the characters are used to and what you would expect when watching them.
Yuki is a disaffected middle school boy who has no dreams or goals in life; in fact, the only thing he has is his diary. Writing down everything he observes and documenting every thought, the young boy uses it as an outlet for his imagination. One morning, however, Yuki wakes up to find his cell phone filled with diary entries for the next ninety days. Thinking nothing of it, he continues his morning until he begins to realize that everything on his phone is rapidly coming to pass, and it isn't just mere coincidence. Now, Yuki suddenly finds himself thrust into a survival game against other future diary owners to become the new Lord of Time.
In both series, the protagonists are playing a game in which they would have to win in order to live.
Since the main topic of both animes is the topic of a survival game. So if you are a fond of those there is a great possibility that you like the other anime too.
However mirai nikki focuses more on horror and psychological elements the SAO does.
One day, without warning, a huge hole appeared in the world and demons emerged, ready for battle. Assuming that the demon king sealed by a hero 1,000 years ago must have escaped, the king of the land set forth a decree: the hero’s descendents must defeat evil once more! For Alba, one such would-be hero, this journey will be anything but ordinary given his growing collection of bizarre and wacky companions. Alongside young demon Ruki, age-inappropriate Ruldolf, tentacle-fighter witch Zwei and a host of others, Alba will get arrested, play dodgeball, travel across the land, and least importantly, learn the truth about the hole in the world!
The year is 2022, and gamers have lined up on launch day for Sword Art Online, a hotly-anticipated MMORPG that lets players connect to an immersive virtual reality world with special helmets called Nerve Gear. Kirito is one such gamer who's eager to jump back into action, having spent a great deal of time as a beta tester, and quickly becomes friends with newbie warrior Klein. But soon, Sword Art Online's 10,000 players discover that not only are they unable to log out, the only way they can return to their physical bodies is by beating the 100-level tower's final boss - that is, if their HP doesn't drop to zero first, for death in the game means death in the real world. Now, with no one else to turn to, Kirito and the other participants must survive the game as best they can – some forming guilds, others ruthlessly leaving their peers behind, and many tragically falling by the wayside or to the merciless monsters populating the lands...
They are both about a sword wielding hero who is set out to battle monsters.Both reminded me of Role-Playing Games.
However Senyuu is more on a comedy side while SAO is more serious.