If you liked
Arifureta Shokugyou de Sekai Saikyou
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...then you might like
Hazurewaku no "Joutai Ijou Skill" de Saikyou ni Natta Ore ga Subete wo Juurin suru made
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Same thing. Bunch of Japanese students summoned in another world, weak outcast mc who falls in dungeon and suddenly becomes incredibly OP after one episode, cute blonde girl as a companion, revenge subplot, shitty CGI, edgyness, "so bad it's good" vibes, etc.
If you liked
AIKa
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...then you might like
Freezing
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Blonde mc, ecchi action, tons of kawaii schoolgirls and white panties (WHITE PANTIES) in every frame. Cultured content in both.
If you liked
One Punch Man
|
...then you might like
Sokushi Cheat ga Saikyou sugite, Isekai no Yatsura ga Marude Aite ni Naranai n desu ga.
|
Adventures of a creature who can one-shot anyone and anything he wants. OPM is more action-oriented anime while Instant Death is a simple isekai comedy with some absurd/parody elements.
If you liked
Elfen Lied
|
...then you might like
Hametsu no Oukoku
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Two races (agressive humans and victims of their genocide - female "humans" with destructive abilies) who are in fight with each other. Gore, blood, lots of deaths, revenge, and calm opening songs in contrast of the anime events.
If you liked
Akudama Drive
|
...then you might like
Cyberpunk: Edgerunners
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Over-the-top action and madness in cyberpunk dystopian society. Akudama is more dark, harsh and based on a "death game with freaks" trope while Edgerunners is your standard colorful action by Studio Trigger that is mostly oriented to the Western audience, now with edgy violence and cybernetic nipples.
If you liked
Nazo no Kanojo X
|
...then you might like
Yofukashi no Uta
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Simple cozy romance between two weirdos who are linked with each other through human liquids (blood in Yofukashi and drool in Kanojo).
If you liked
Code Geass: Boukoku no Akito 1 - Yokuryuu wa Maiorita
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...then you might like
86
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Similar premise, themes, characters (Vladilena/Shin and Leila/Akito), spider mechas, CGI action scenes and dialogues. 86 is so similar to Code Geass Akito that it feels like a blatant copy or a parody.
If you liked
Mazinkaiser SKL
|
...then you might like
Back Arrow
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Two heavy-packed action anime about nations who fight for domination of a limited space (Machine Island in SKL and Lingalind in BA) using magical giant robots until an overpowered protagonist with a cooler robot suddenly appears. Mazinkaiser SKL is basically a much more dynamic version of Back Arrow with awesome animation and hand-drawn robots.
If you liked
Dual! Parallel Lun-Lun Monogatari
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...then you might like
Muv-Luv Alternative
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MC isekai-d from our world to a parallel mecha-apocalyptic Earth, met alternative versions of people he knows and claimed a harem of kawaii girls. Simply put, Dual is a spirital ancestor of Muv-Luv Unlimited/Alternative, but without their deepness and drama.
If you liked
Kono Subarashii Sekai ni Shukufuku wo!
|
...then you might like
Meikyuu Black Company
|
Isekai shows with similar jokes and character interactions. While Konosuba is more a DnD and isekai parody, Meikyuu Black Company is a black (surprise, yeah?) comedy about the Japanese economy mixed with some SRPG references. Kinji is basically a grown-up evil version of Kazuma. However, Black Company has less fanservice and isn't a harem.
If you liked
Mob Psycho 100
|
...then you might like
Heion Sedai no Idaten-tachi
|
Similar animation style and wacky comedy mixed with colorful fights.
If you liked
Kyoukai no Kanata
|
...then you might like
Jujutsu Kaisen
|
Supernatural action series with the same concept: a bunch of chosen ones - Jujutsu sorcerers/Spirit World warriors are fighting against different Curses/Youmu - most of them are just brainless monsters, but some can communicate and even imitate a human form. The most principal difference between these two shows is that Beyond the Boundary is a SoL moe romance while JJK is a classic battle shounen.
If you liked
Mousou Dairinin
|
...then you might like
Oretachi ni Tsubasa wa Nai: Under the Innocent Sky.
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Oretachi is a moe-ecchi-harem version of Paranoia Agent: similar strange events that happens in one town and connected with mind problems. Both have solid direction, too.
If you liked
Hoshiai no Sora
|
...then you might like
2.43: Seiin Koukou Danshi Volley-bu
|
Drama-oriented sports anime with seinen vibes that focus less on actual sport and more on the psychological problems of the characters. Both also have a similar watercolor visual style.
If you liked
Akane Maniax
|
...then you might like
Honoo no Tenkousei
|
Same energy, same start: MC transfers to another school and start to fight for the love. Honoo no Tenkousei is a parody of all sports/delinquents anime, while Akane Maniax is a parody of school romance and other parts of the age universe (KimiNozo/MuvLuv).
If you liked
Kurozuka
|
...then you might like
Gibiate
|
If you liked the idea "samurai isekaid to the post-apocalyptic world with monsters" but was disappointed by Gibiate because of how poor its animation is, try Kurozuka - a similar thing, but with awesome Madhouse visual style and bloody, dynamic action scenes.
If you liked
Yojouhan Shinwa Taikei
|
...then you might like
Occultic;Nine
|
Unique visual style & directing, mysteries & plot twists, extremely fast dialogue, and overall bizarreness.
If you liked
Paprika
|
...then you might like
Id:Invaded
|
An eccentric person who jumps into the people's minds using a special device, alter ego with different behavior and goals, psychological aspects, mystery, absurd action, pretty obvious villain - combine all of them into one and you'll get Paprika. Add cheap graphics, weird character designs, and plot holes, and you'll get Id: Invaded. Enjoy!
If you liked
A Kite
|
...then you might like
Mardock Scramble: The First Compression
|
Mardock Scramble is the modern version of Kite. Dark atmosphere, young prostitute (Sawa in Kite and Rune in Mardock) as a protagonist, well-directed and brutal action scenes, nudity and sex, revenge and love, blood and gore, et cetera.
If you liked
Alien 9
|
...then you might like
Dead Dead Demons Dededede Destruction
|
Cute girls against the world apocalypse. Similar plot elements (people who live in a world where alien invasion became an actual life), moral problems, type of comedy, and characters. Kasumi = Ontan. DeDeDe is much deeper and emotional than Alien 9, but both of them are enjoyable.