From left to right is Rita, Nagi and Cecil.
Being Able to Edit Skills in Another World, I Gained OP Waifus (Isekai de Skill wo Kaitai shitara Cheat na Yome ga Zoushoku Shimashita: Gainen Kousa no Structure) is a series of Light Novels written by Sakaki Sengetsu and illustrated by Minami Katase, which began publication in 2016. A manga adaptation began serialization in the magazine Dragon Age in 2017.When an entire bus of people are summoned to another world, Souma Nagi doesn't go along with the idea of being a Hero like the rest. Thus, he leaves the palace and starts his life in another world with his ability to restructure skills.
This work includes the following tropes:
- Above the Influence: Despite knowing that his Battle Harem desperately wants to bear his children, and being strongly attracted to his slave harem, Nagi Soma keeps the sex G-Rated until he can construct an environment where children can be raised safely.
- Adaptation Expansion: The manga covers things the light novel does not, like the reaction of the rest of Nagi's class to the situation.
- Aristocrats Are Evil: With the exception of Letcia Milfe and Iris Irfaga, all the aristocrats shown in the story are arrogant, cowardly, despicable people with no ability who are absolutely convinced that they are superior to everyone in everything, and will resort to outright murder to prop up the illusion that they actually are.
- Battle Harem: The title basically spells it out. Nagi Soma's waifus are all insanely powerful for the world setting, thanks to his efforts.
- Big Bad: King Natla, the one who summoned Nagi’s class to the other world and tricked most of them into agreeing to magic contracts that force them to work for him until they defeat the Demon King (who may not even exist).
- The Call Knows Where You Live: The call is quite schizophrenic where Nagi's concerned. First, he's Kidnapped by the Call when his school's bus is summoned to this New World, with him on it. Then he's Refused by the Call when King Nadla has his knights literally throw him out with little more than the clothes on his back. Then the aristocracy keeps going after him for little to no reason. So by the end, he's become quite Resigned to the Call.
- Crapsaccharine World: The New World doesn't look much different from Earth, and the capital city the class was summoned to looks quite happy... Then you look just a little beneath the surface and things are quite scary indeed. There's also supposed to be a Demon King army invading from another world out there somewhere.
- Dark and Troubled Past: All the main characters, full-stop.
- Darker and Edgier: In addition to being Hotter and Sexier, the tone is darker and things more dangerous in general, not just for Nagi and harem, but for the rest of the population in the new world Nagi finds himself in.
- Deconstruction: Of the Isekai Genre. A bus-full of people are summoned to a strange world by a king who asks them to defeat a demon king. Protagonist Nagi Soma begins asking multiple questions that the king is unable to answer and the king kicks Nagi out with barely enough money to survive a few days. Nagi finds out that the Demon King might not really exist and that there are several hurdles in the world that results in the other summoned humans to become slaves. Meanwhile, the other Isekai heroes are indoctrinated and reforged into insane Tautological Templars. This shows that when someone summons you to another world, don't take what they say at face value.
- Deliberate Values Dissonance: In this new world, it's a grievous insult to free a slave on a whim, although slaves can earn their freedom by merit.
- Fantastic Racism: Humans, the major species, discriminate against all the other races. It's most prominent with the followers of the Iturna cult, in spite of the fact that helping the needy is one of the goddess' main teachings.
- Freedom from Choice: All the members of Nagi's slave harem are perfectly happy letting him make all the decisions. This is justified by the fact that when the girls had the freedom to make their own choices, their lives were sheer and utter crap.
- G-Rated Sex: When Nagi adjusts or modifies the skills of his slave Battle Harem, the girls' reactions are quite... provocative, but there is never genital to genital contact.
- Go Look At The Distraction: Nagi distracts Tanaka by talking about how hard it is to dry a girl's hair without hair dryers, giving Leticia an opening to take Aine's memory crystal.
- Good Is Not Soft: Nagi and his waifus are all good, decent, morally upright, and benevolent, always eager to help others. Antagonize them, or endanger the populace for petty reasons, woe be onto you.
- Happiness in Slavery: Every last member of Nagi's Slave Harem is there because she wants to be. Also criticized In-Universe. The fact that his slave harem calls him "husband" not "master" weirds out everyone who hears it, including Nagi himself. When he goes on dates with them, and eventually starts undertaking rituals to make the husband/wife stuff legit, everybody who can actually run such rituals is genuinely freaked out.
- Heroic Wannabe: With very rare exceptions, all of the classmates summoned alongside Nagi, and most of the antagonists, do despicable things thinking that doing so will make them "heroes."
- Hero's Slave Harem: Of the Unwanted Harem variety. Although Nagi seeks out and buys Cecil Pharot, he intended to free her, but she refused, seeing that as a form of abandonment. As a result of his genuinely heroic journey, he winds up saddled with several other slave girls through circumstances beyond his control that he's also unable to free. To his credit, they are the ones who want the sexy-fun times far more often than not.
- Hotter and Sexier: The manga is considerably more explicit than the light novel, but it's along the lines of Pg-13 sex compared to G-rated.
- Interspecies Romance: Nagi is human, but several of his waifus are not.
- Let Us Never Speak of This Again: When Nagi uses his power over Cecil to bring out her deepest wish, she reveals she wants to have Nagi's children. Nagi and Rita agree to forget they ever heard all of that.
- Like a Duck Takes to Water: Nagi adjusts to life in the New World in less than a week. Other "Visitors" are still trying to adapt despite being there for decades, and not all of them come from Earth.
- Made a Slave: All the main characters, including Nagi, though not in name. This New World is a considerable improvement to his previous life on Earth.
- Mundane Made Awesome: Pretty much the point of the story. Such mundane skills as sweep buildings and cleaning sludge from a drain find themselves being restructured to awesome effect by the protagonist.
- My Country Tis of Thee That I Sting: The author is Japanese, the work is Japanese, the intended audience is Japanese. Nagi and the transmigrators are all Japanese. Nagi, the Main Character, is the White Sheep. Everyone else brought to this new world from Japan does horrible, horrible things, without hesitation or remorse, deluding themselves into thinking it's "heroic", completely chuuni style, and Nagi's memories of Japan, and its culture, are almost all horrific.
- New Life in Another World Bonus: Skill Structure allows Nagi to do exactly that.
- No OSHA Compliance: All of Nagi's "part time jobs" on Earth, that he was dragged into against his will.
- No Such Thing as H.R.: Nagi was forcefully "recruited" and treated as a slave in no less than five "part-time" jobs, and he had no HR department to complain to, or worse, they were all completely corrupt and dismissive, making his attempts to get in touch with the Labor Board meaningless.
- Obstructive Code of Conduct: "Contract" magic. The New World has an actual god that enforces contracts. It does not care a whit about the situation under which the contract is made. People can be forced to enter a contract under threat of death, and they still must comply with their end, to the letter. If they don't actively strive to keep their end, they get inflicted with increasing levels of insomnia until they comply or die.
- Our Elves Are Different: The elves of this world setting, though a long time ago, were not only very urban, but complete and total litterbugs. Nothing like elves of other works that are nature lovers.
- Overrated and Underleveled: Mostly inverted. While they are underleveled, the main characters are underrated and overpowered.
- Powers as Programs: Skills can be bought, sold, improved, absorbed, and expelled by people without issue. Nagi has a skill that lets him change how skills work by exchanging words between any two.
- Properly Paranoid: Nagi is convinced that should people know his full strength, they would stop at nothing to enslave, exploit, kill, or manipulate him to his doom. He's proven right the night of his very first day!
- Reconstruction: Of the Unwanted Harem genre. Nagi has several attractive women enslaved and forced unto him by circumstances beyond his control. Although they are all quite fond of him, and he's earned it, the novel version goes into exquisite detail regarding all the problems involved. Keeping them all happy, healthy, and safe is a herculean effort and is expensive. Nagi crunches the numbers off-screen and tells his waifus that they have to secure a 3000 silver coin a month income before things are stable enough to even think of bringing children into the equation. The party often deals with envy and jealousy of those who can see their prosperity but not the effort required to get that prosperity. The circumstances that got Nagi his harem have also got him quite a few enemies. The opportunities Nagi and crew have to earn a living are limited, even though they are all powerful and skilled. Does he think it's all Worth It? You betcha!
- Stupid Evil: The royalty and aristocrats (among other human-centrist and supremacist factions) are all hell-bent on wiping out any and all "competition" as far as fighting the Demon King army is concerned, thus forcing the populace to rely on them and them alone for rescue and protection. The biggest glaring flaw with this "strategy" is that humanity needs all the help it can get in fighting the Demon King army in the first place, otherwise Nagi and his class would never have been summoned to this New World.
- Unwanted Harem: Nagi only sought out and bought Cecil Pharot, for pragmatic not romantic reasons. The rest of his slave Battle Harem was basically forced upon him by circumstances beyond his control. He still treasures each and every one of them though.
