If you liked
Isekai no Seikishi Monogatari
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...then you might like
Break Blade Movie 1: Kakusei no Toki
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Main character who pilots an ancient and incredibly powerful mech that no one else can use in order to save his country.
If you liked
Ijiranaide, Nagatoro-san
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...then you might like
Yancha Gal no Anjou-san
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A nerdy guy getting constantly teased by a cute girl.
If you liked
Overlord
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...then you might like
Isekai Maou to Shoukan Shoujo no Dorei Majutsu
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A player gets transported inside a game as his in-game OP magic caster character.
If you liked
Kaguya-sama wa Kokurasetai: Tensai-tachi no Renai Zunousen
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...then you might like
Komi-san wa, Comyushou desu.
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Both are romantic comedies that focus on the daily lives of high school students, with main characters that like each other, and a hilarious cast of supporting characters.
If you liked
Bradherley no Basha
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...then you might like
Wolfsmund
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Short stories about characters meeting terrible endings.
If you liked
Kamisama no Iutoori
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...then you might like
Ousama Game
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An entire class dragged into one deadly game after another with no choice but to play or die.
If you liked
Tokyo Ghoul
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...then you might like
Ajin
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A world where a certain kind of individuals are being persecuted and hunted, and an MC that gets thrust into that world, becoming one of them without having a choice.
If you liked
Tate no Yuusha no Nariagari
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...then you might like
Tsuki ga Michibiku Isekai Douchuu
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Main character that gets summoned to another world to be a hero, but instead gets completely screwed over by the person that summoned him and ends up having to survive on his own.
If you liked
Shingeki no Kyojin
|
...then you might like
Dolly♥Kill Kill
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Giant monsters that kill humans for no apparent reason, and an MC that joins an anti-monster organization with the goal of annihilating them all.
If you liked
Kenpuu Denki Berserk
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...then you might like
Hellsing Ultimate
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Anime that indulge the viewer in extreme amounts of blood and gore with a badass MC that doesn't hold back. A must-watch series.
If you liked
Feng Shen Ji
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...then you might like
Xi Xing Ji
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Made by the same people, these two manhua revolve around conflicts against gods by a boy that starts out small but finds allies that help him get stronger, battles that get more and more epic each time, complimented by some stunningly colorful art. If you liked one, then you'll definitely love the other.
If you liked
Gantz
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...then you might like
Kamisama no Iutoori
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High risk survival manga with multiple rounds that differ from each other by one thing or the other. The main character starts out slow and gradually becomes the central figure for everyone's survival.
If you liked
Claymore
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...then you might like
Garo: Honoo no Kokuin
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Main character part of an order that has been created to fight dangerous demons that eat and take the form of humans they've devoured.
If you liked
Re:Monster
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...then you might like
Tensei shitara Slime Datta Ken
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MC gets killed and reincarnates in a fantasy world as a monster, he has an ability which allows him to absorb his enemy's flesh and obtain new skills. In both the MC starts out with goblins and slowly takes in other people/monsters as he gains more power.
If you liked
Skyhigh
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...then you might like
About Death
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Both manga center on what happens after one's death. Though Skyhigh takes a more darker approach.
If you liked
Akatsuki no Yona
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...then you might like
Arslan Senki (TV)
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The main characters are both next in like for the throne until a coup happens by an evil cousin, which forces them to flee from their home while being protected by the strongest warrior in the army. Both characters are weak combat-wise and rely on others to do all the dirty job, they go a journey to find strong warriors to help them reclaim the Kingdom.
If you liked
NHK ni Youkoso!
|
...then you might like
Steins;Gate
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Extremely similar main male leads, both believing in existence of secret organizations that are after them, and both are pretty awkward when it comes to social interactions. Both anime start out in earlier episodes mainly focused on humor, but slowly shift into darker themes.
If you liked
Oretama
|
...then you might like
Jigokuren: Love in the Hell
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Both manga MC's are put in a situation where they're stuck with a demon from hell, unexpectedly though they start to develop feelings for each other.
If you liked
Psycho-Pass
|
...then you might like
Hamatora The Animation
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In both series the main antagonist is someone who doesn't like dirtying his hand and instead gives others the means to comment crimes, the main characters deal with these cases, but are unable to catch the main culprit.
If you liked
Shinmai Maou no Testament
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...then you might like
Masou Gakuen HxH
|
The male main character has to do indecent stuff with the other girls in order to increase their fighting capabilities, thus both are very ecchi anime.
If you liked
Seitokai Yakuindomo
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...then you might like
Shimoneta to Iu Gainen ga Sonzai Shinai Taikutsu na Sekai
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Male main character who works as a student council member and girls who are supposed to be the examples of discipline and good behavior for their fellow students are actually perverted beyond belief, both anime have a huge array of dirty jokes and funny situations, if you liked one then you will definitely like the other.
If you liked
Akumetsu
|
...then you might like
Sun-Ken Rock
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First of all the MCs look very similar not only in appearance but in their personal beliefs. If you want to see a high schooler going against people of higher social standing than him for justice, with good violence, then Akumetsu is a much better alternative. If you liked Akumetsu's action though and would like to add some silly comedy, then Sun-Ken Rock is what you're looking.
If you liked
Sengoku Otome: Momoiro Paradox
|
...then you might like
Oda Nobuna no Yabou
|
In both cases a high school student is mysteriously transported in the Sengoku era where he fights alongside historical figures like Oda Nobunaga and Akechi Mitsuhide in an effort to unify Japan.
If you liked
Heroic Age
|
...then you might like
Captain Herlock
|
Both anime have multiple battles in space, in Heroic Age the numbers are far bigger and thus the battles longer. Also everything is done in order to save earth.
If you liked
Highschool of the Dead
|
...then you might like
Apocalypse no Toride
|
Both manga start in an enclosed area, HOTD in a school and AnT in a juvenile prison, infected zombies somehow manage to get inside so chaos errupts and the main character is forced to abandon that place in search of their own relatives along with some other people. Although AnT gets a lot more fucked up further in the story.
If you liked
Death Note
|
...then you might like
Code Geass: Hangyaku no Lelouch
|
A high school student is given a power, with that they decide to change the world into a better place, they both slowly form alliances and the people see them as heroes.
If you liked
Steins;Gate
|
...then you might like
Re:Zero kara Hajimeru Isekai Seikatsu
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In both anime the main character starts from the beginning each time he fails to save his beloved person, both see them die again and again in multiple ways and that experience takes its toll, They both lose hope at one point but someone gives them the courage to not stop and continue.
If you liked
Shingeki no Kyojin
|
...then you might like
Koutetsujou no Kabaneri
|
In both anime humanity has been driven to extinction by an armageddon that happened in the past, in Shingeki no Kyojin by titans while in Koutetsujou no Kabaneri by the kabane. It is made by the same studio (Wit). Both anime start inside a fortified settlement showing the seemingly peaceful lives the people live, only to have it crumble in the face of the cruel reality.