At the end of his life, in his elder years, Aur completed his lifelong research: a flask of pure concentrated mana, with this Aur proceeds to engage his nefarious plans against humanity, he a human himself has harbored extreme hatred towards humankind, thinking they are nothing but vile creatures who in the end will betray one another for their own gains.
Aur rejuvenates himself with his newfound power and summons a demon to start his initiative, Lilu the Succubus is brought before Aur, he makes a contract with her to assist him in building a dungeon, a place to be his headquarters in which Aur will bring many followers to his cause and serve as a target for adventurers and the like to try against him, in which Aur will make use of these fools to add onto his power.
From there on the misanthropic Aur makes several advances towards human settlements and kingdoms, demanding them to become his subjects, using several underhanded and downright evil methods to overthrow them; all of this while having his way with many women in his tyrannical streak.
Maou no Hajimekata (lit. How to get started as the Demon King) began as a series of free Adult Web Novels written by Warau Yakan in 2011, In 2015 he decided to make the once free hobby into a professional work and so it became a Light Novel series published by Kill Time Communication; now paired with an artist, Shindou Arata, Yakan decided to expand his original concept and make a broader story.
Also in 2015 the series got a manga adaptation called Maou no Hajimekata The Comic, drawn by Komiya Toshimasa and written by Warau Yakan himself, the adaptation maintains the adult content from the novels by running in Comic Valkyrie, a seinen magazine, published by Kill Time Communication as well. Seven Seas Entertainment has picked the series up for English localization as How to Build a Dungeon: Book of the Demon King, the first volume released in October 2016.
Tropes used in this series include:
- Anti-Magic: Zietlied's "Curse of Lead" means he's unable to use magic, but also is impervious to it.
- Bad Guys Do the Dirty Work: played with by Aur. When heroine Yunis comes to kill him at a village's request, he takes his aid back from the village and has Lilu incite them to blame her. In an effort to corrupt Yunis and win her loyalty, he then takes her to said village where the villagers try to stone her in rage for doing what they asked. Once Yunis finally broke and tried to kill the villagers, Aur killed them for her, claiming it's a villain's job. The ploy works and Yunis swears both loyalty and love to him.
- Battle Harem: Aur will mostly recruit women who will serve him in a way to go against humanity: succubus, warrior elves, warriors, magicians, swordsmen; all with varying levels of fighting abilities or support, he does sex them all up but they are useful out of bed.
- Bed Trick: In the confrontation with Alan's Raiders, after defeating them, Aur disguises himself as Alan and enters Naja's prison cell, predicting that they had Unresolved Sexual Tension. He repeatedly rapes Naja under this disguise in order to plant the magical suggestion that she was working for him the whole time.
- Big Ol' Eyebrows: Aur in the Manga sports a brushy pair.
- Black and Grey Morality: For a Villain Protagonist, Evil Overlord, and Serial Rapist, Aur is relatively sympathetic, benign to the lands he conquers and apologetic for many (but not all) of his more brutal actions. And most of the humans with actual power in the world seem to be at least as bad as he is, "hero" or no.
- Brainwashing: Aur brainwashes several humanoid adventurers who come to the dungeon to kill him into joining his side. Yunis is eventually cured, but is still sympathetic to him, which ends in her being beheaded by her brother.
- Bread Milk Eggs Squick: When Aur brings his first sacrificial maidens, Marybell and Spina, to the dungeon, he has Lilu teach them the standard tasks: "things like patrolling, laundry, managing monsters and traps, disposing of corpses, preparing meals..."
- Clothing Damage: In the manga Yunis loses part of her breastplate (ha!) while fighting Zietlied, exposing her chest.
- The Corrupter: Aur does it with an incredibly perverse touch, some women join his cause (and harem) because they don't like humanity either or are just indifferent towards them; women who saw Aur as the evil being he is however are met with many phases of brainwashing through sex, Aur implants them with memories of him always being a lover of theirs, or impersonates their actual lover if the woman in question is already engaged, and in any case it ends with the women falling to perverse lust and seeing Aur as the only man in their lives, completely agreeing and assisting him with his evil deeds.
- Curbstomp Battle: Yunis is one of Aur's best fighters, but her brother Zietlied is immune to their magic and too much of a Mighty Glacier for her to wound. He easily beats her unconscious and takes her home with him.
- Disproportionate Retribution: It's implied Aur once suffered a great betrayal that left him completely disgusted with humanity; he then proceeds to become a Demon Lord with the goal of making all of mankind be miserable and serve him as their new overlord, the catch is that Aur is the resident Villain Protagonist and the plot glorifies his deeds. He constantly tries to upstage himself in extremely nefarious schemes to bring villages and towns to his rule, to add Aur has a thing for making women his sex relievers, going for mind control and then raping them to submission if they don't like him right away.
- Even Evil Has Standards: Playing up the part of Demon Lord Aur goes to a village and demands a virgin maiden as a tribute for him, the village chief offers him a little girl, Maria. Aur asks if they are trying to mess with him, and the chief responds that all maidens were taken by bandits, royalty and the like, so Maria was the only virgin left. Aur decides to take Maria anyway, reasoning she could be of some use one day, unlike all other women Aur likes to have his way with it seems he pulls the break on little girls at least, treating Maria with some kindness even, like a mascot. Lilu however starts lecturing the innocent Maria on sex education so when she matures she can finally start servicing Aur.
- Evil Overlord: What Aur became after attaining great power from a lifetime of research; he really does the part with gusto, evil deed after evil deed.
- Fantastic Arousal: When having sex with Lilu in the first chapter Aur notes her stamina has to do with the fact that her body is a magical construct that serves as a vessel for her soul. With this in mind he uses his own magic to alter her body to have heightened sensitivity one might expect from a succubus and it reduces her to a moaning, screaming mess.
- Forced to Watch: The last of Alan's torment, Aur had already fully corrupted two of Alan's female companions, however Aur saved the last to torment him further, Wikia let it go of her last remainder of willpower against Aur's manipulation and falls to diabolic lust, being deprived of her virginity by Aur and swearing her loyalty to him right in front of Alan.
- Gratuitous English: There is an "official" English Title accompanied by the Japanese Title in the original print, needless to say How to book on the Devil isn't quite correct.
- Harem Genre: In the root of things this is basically the main focus of the series, Aur will have his way with many women; ploy against humanity, sieges, magic, scuffles are all there as a backdrop and as a mean to introduce more women.
- Horny Devils: Lilu, being a succubus she thought Aur summoned her solely for sexual pleasure while in fact he wanted an adjutant for his plans, he does have sex with her but Lilu is mostly used for general affairs in the dungeon, something that frustrates Lilu when she is overloaded with tasks, thinking that being just a sex reliever would be easier.
- Humans Are Bastards: The conclusion Aur has reached, he believes humanity are a collective of selfish beings who will sell out and betray anyone, anytime and anywhere if it means saving their behinds; something happened in his life, implied to be a massive betrayal that left him in shambles, it turned him into the cold demon lord that Aur is today, someone whose only life goal is to make humanity suffer and submit them to his rule. The irony is that Aur himself is a human being, performing greater acts of evil out of misguided hatred; he is proving his own view to be right.
- Invincible Villain: Despite his self-proclaimed limited combat prowess, it seems that Aur always manages to get around his weakness and drag his foes over his preferred playground. Epic curbstomp happens after.
- Jackass Genie: Defied: Aur puts together a very thorough contract to keep Lilu in line after summoning her to prevent any Loophole Abuse in their agreement that could give her the upper hand.
- Misanthrope Supreme: The core of Aur's character, he is a human who grew to harbor immense hatred towards his own kind, justifying his hatred by some event that happened in his past, implied to be a great betrayal that left him a broken mess; Aur goes on to become a sorcerer, taking up the title of Demon Lord and vowing to make humanity become his miserable pawns, Aur wastes no time in making many humans go through horrible ordeals, from genocide, to enslaving, to manipulating, to raping, anything goes as far as Aur is concerned.
- Netorare: Invoked. Aur employed it step by step, as if he had a guide book, against Alan the Warrior, he corrupted Alan's three female companions and made it sure to show it to him, before having one of the girls behead Alan, using Alan's torrent of surging hatred for feeling betrayed to then resurrect him as a powerful ally, a Dullahan. Only the first notable case of something that Aur will make use of many times later, including against Zietlied, whose wife Aur first seduces then tricks him into killing as part of the effort.
- Night of the Living Mooks: Aur incorporates a number of kinds of undead in his forces, including Alan, an adventurer he resurrects as a Dullahan (a ghoul powered by the angry spirit bound to the body; see Netorare above), and Yunis's brother Zietlied, whose body he reanimates (minus the spirit, which automatically went to heaven due to Zietlied being a Hero).
- No Brows: In the Light Novels however he is clean shaven, giving great focus to his frown.
- Non-Indicative Name: Aur's full name, Ain Soph Aur, it comes straight out of the Kabbalah, meaning "The Limitless Light", commonly referred to as being God Himself; extremely ironic, and maybe pretentious, considering the kind of person Aur is.
- "Not If They Enjoyed It" Rationalization: Averted. Aur is a considerate lover, but the fact that it's frequently still rape (by mind control if nothing else) is stated outright by his own allies.
- Not Safe for Work: The manga stops just short of hentai territory: in the many sex scenes the genitalia aren't drawn but nearly everything else is.
- Off with His Head!:
- Aur has the brainwashed Naja behead her former companion Alan after he's secured the allegiance of his former adventuring party. He turns Alan into a zombie to guard the dungeon afterward.
- After conquering Figuria, Aur has his demon companion Logan behead the king. It's later explained that Figuria had previously conquered and ravaged Aur's homeland.
- Yunis is beheaded by her own brother after telling Aur she still loves him, even with the brainwashing removed.
- Older Than They Look: Aur was an old man at the end of his lifespan by the time he finished his mana potion, rejuvenating himself was the first thing he did with his new immense power. Also the many demons and other races seen in the series.
- Our Elves Are Better: Alfar are pretty much your basic fantasy elves. Aur initially is joined voluntarily by a group of dark alfar (i.e. drow) who serve in his army as archers, able to blow a man apart with an arrow from hundreds of meters off. Later he brainwashes Sher, a light alfar (high elf) priestess who attacks the dungeon with Alan's Raiders.
- Perpetual Frowner: Aur's default look, properly portraying the kind of man he is; although he sometimes makes gentle expressions towards those he has recruited, mostly women, even flat out manipulating his facial structure with magic to give those who meets him for the first time a false impression that he is a benevolent man.
- Porn with Plot: The sex scenes and dialogue in the manga are quite explicit (the genitals are not drawn or whited out, but nearly everything else is shown) but are far from being the primary focus of the series.
- The Power of Hate: Aur makes use of Alan's complete surge of hatred after taking his girls away; after getting beheaded Alan is resurrected by Aur with immense hatred as the power source, Alan becomes a Dullahan in Aur's service.
- Pragmatic Villainy: Aur treats those who have become his subjects with decency, even if he has fooled some demons to become part of his army or the women he violated to submission, he gives them what they want by being at his side thus ensuring loyalty, erasing suspicion and lingering hatred from those who hated him before they joined his ranks.
- Really Gets Around: Aur has his way with many, many women, over the course of the series; that's his usual method of recruiting them and make them bend to his will, he is not above taking women already engaged in a relationship either, in fact he doesn't care if he's Pragmatic Villain reason to want them.
- Rewarded as a Traitor Deserves: Aur is captured by Figurian strategist Cass, an advisor to the king, in chapter 13. He works out that she's going behind the king's back and hopes to use him to advance herself. After he's rescued by Yunis and the others in the next chapter, he rejects Cass's offer to ally with him to save herself and burns her alive.
- Role-Playing Game Verse: The series is heavily influenced by JRPGs, and out-of-universe end-of-chapter pages even list characters' classes and power levels.
- Start of Darkness: Aur's past is given a proper show in the manga. He was apparently forced, by mind control, magic, brainwashing, or threat of violence, to go after his mentor, a kind and very attractive female druid and herbalist, who raised him as her own son, and when he found her, kill her with his own hands, which he does. He swears to have his vengeance against the kingdom(s) that forced him to do it. thus dedicating his life to becoming a Demon Lord...
- The Stoic: Due his advanced (real) age and firm belief that he knows all humanity (i.e: they are all trash) that's Aur's personae, he isn't fazed by anything because he will always be a step ahead.
- Villain Protagonist: Aur is a cold and nefarious man, he made a point in his introduction that he absolutely loathes humanity and will do whatever it takes to make them bend over to his will through all kinds of evil Aur plans for them, throughout the series we see he wasn't joking.
- Virgin Power: Suggested, not clear if it's actually in effect. Aur initially avoids seducing his female apprentice Spina, a Misanthrope Supreme like himself who had horribly burned herself with hot oil to make herself unattractive to bandits (Aur healed her body with magic when he took her on). He tells her that her virginity is a source of power, but she goes to such lengths to seduce him that he relents and has sex with her.