If you liked
Otome Game Sekai wa Mob ni Kibishii Sekai desu
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...then you might like
Chounin A wa Akuyaku Reijou wo Doushitemo Sukuitai: Dobu to Sora to Koori no Himegimi
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Both are an otome game isekai, with a male protag. Both have 5 idiots who simps on the isekaid female protag of the game (not the villainess). Both has guns and magic. Except the other one has mechs in it.
If you liked
Solo Leveling
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...then you might like
Kono Sekai ga Izure Horobu Koto wo, Ore dake ga Shitteiru: Monster ga Arawareta Sekai de, Shinimodori Level Up
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This manga is just Japanese returner/hunter/time leaper where mc gets stronger by grinding video game stats in the modern world where monsters from another world invade it. MC even "solo levels" in the first few and in some other chapters.
If you liked
AV Danyuu Hajimemashita
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...then you might like
Isekai Danyuu: Shirudanyuu ga Isekai Tensei shite Ero Chishiki Full Katsuyou de Musou Danyuu ni Naru Hanashi
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They're both the same thing except that the other one is an isekai. While the other one is much more realistic.
If you liked
Isekai demo Bunan ni Ikitai Shoukougun
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...then you might like
Hiroyuki, Isekai demo Ronpa de Musou shimasu
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logic and words > any isekai cheat
If you liked
Oukoku e Tsuzuku Michi: Dorei Kenshi no Nariagari Harem Life
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...then you might like
Koushaku Chakunan Koushoku Monogatari: Isekai Harem Eiyuu Senki
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They're both in a medieval setting. The other one is a physically strong mercenary while the other one is of noble lineage who can use magic. They look different but they have lots of sexual escapades in territories they visit or conquer.
If you liked
Mezzo Forte
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...then you might like
Cyberpunk: Edgerunners
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Mezzo Forte is like a shorter Cyberpunk spin-off. They both have the same theme of the corporate exploiting the masses. Both also have a gang of outcasts who try to live by in such a futuristic dystopian world. Mezzo Forte may in no way be connected to the Cyberpunk 2077 but it has a feeling of being a side quest or DLC mission of the game. You might enjoy this one if you enjoyed the Edgerunners anime.
If you liked
High Score Girl
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...then you might like
Isekai Ojisan
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Both have retro gaming references from games mostly in the 90's.
If you liked
Monster ga Afureru Sekai ni Natta node, Suki ni Ikitai to Omoimasu
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...then you might like
Zombie no Afureta Sekai de Ore dake ga Osowarenai
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"Zombie no Afureta Sekai de Ore dake ga Osowarenai" is basically a spicy version of "Monster ga Afureru Sekai ni Natta node, Suki ni Ikitai to Omoimasu". Both are set in a modern setting apocalypse wherein both MC has super power.
If you liked
Knight's & Magic
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...then you might like
Class Saiyasune de Urareta Ore wa, Jitsu wa Saikyou Parameter
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Both are rare mech isekai. Knights and Magic is more on mech building while the other one is more battle-oriented.
If you liked
Ishuzoku Reviewers
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...then you might like
Isekai Harem Monogatari
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If you're done watching Ishuzoku Reviewers and you also enjoyed it, you should watch Isekai Harem Monogatari. While the latter may have fewer "species" at least the scenes are explicitly displayed.
If you liked
Kigenzen 10000-nen no Ota
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...then you might like
Dr. Stone
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Both are in a kind of Stone Age where both characters use their "superior modern knowledge" to solve problems. THE PHYSICAL: In Dr. Stone, the main character uses Scientific Knowledge to build things that make Stone Age Life easier, little by little (recreating lost technology e.g. soda, alcohol, lightbulb, transportations, you name it). THE METAPHYISCAL: In Kigenzen 10000-nen no Ota, the main character uses modern knowledge of sexual techniques to "solve problems". Unlike in Dr. Stone, the main character here does not create modern, physical things. He forms relationships to the tribes through sexual intercourse with the prehistoric females using a variety of positions unheard of before (e.g. missionary, sixty-nine, cowgirl, usage of dildos). Basically, if you want a Dr. Stone but hentai, read Kigenzen 10000-nen no Ota. I recommend these two if you want to see a clever use of modern knowledge in a place that is similar to the Stone Age.
Both of them uses their modern knowledge to build and use firearms in a fantasy world. Gun-ota explains the application of magic and knowledge of firearms in a more detailed way. While the other one not as much as Gun-ota but is still quite fine for a quick read.
If you liked
Sentouin, Hakenshimasu!
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...then you might like
Kouchuugun Shikan, Boukensha ni Naru
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Both are isekais that feature a more advanced civilization visiting an underdeveloped planet (Nanomachines, teleportation, firearms, etc.). Sentouin, Hakenshimasu! (Combatants Will Be Dispatched!) is about the comedic misadventures of an evil soldier from an evil company (kind of), while Kouchuu Gunshikan, Boukensha ni Naru (The Galactic Navy Officer Becomes an Adventurer) is about a space soldier trying to return to his empire.