Right at the beginning of the story, the hero Leo Demonhart suddenly announces his desire to join the Demon King's army. Why would a hero who has always fought for humanity's sake decide to join the Demon King's army, their enemy? Leo has his own reasons for doing so, and he also hides many secrets. This time, we'll take a closer look at the story's protagonist, Leo Demonhart.
Leo, the former hero who puts everything on the line for his job interview at the Demon King's Castle
The story begins with Leo's job interview at the Demon King's Castle. With a serious expression, Leo knocks on the door of the castle. The Four Heavenly Kings were waiting ahead, centered around the Demon King Echidna. In a situation that would normally have been explosive, Leo produced a resume instead of a sword. He introduced himself as a "former hero" and declared that he had quit being a hero. His special skills are swordsmanship, black magic, elemental magic, sacred magic, and more. He has a track record of defeating Echidna one-on-one! He's an effective asset! "I wish to join the new Demon King's army, in order to destroy foolish humans and create a millennium kingdom for the demons!" he declared. Naturally, he was rejected. He was immediately told, "You're obviously not going to be hired, you idiot!" So Leo kidnapped...or rather, persuaded...the Four Heavenly Kings, who were acting as deputy examiners, to attend the second interview and be accepted into the Demon King's army. (Don't tell Echidna)
The reason Leo was fighting the Demon King's army alone
About a year ago, Leo fought and defeated the Demon King's army led by Echidna. At the time, Leo had no companions and was fighting the Demon King's army alone. The reason for this was, "To be honest, companions would get in the way." Leo holds the title of Royal Knight and is a top-class mage, alchemist, and ranger. Because he was so skilled at everything, he found priests who could only use healing magic and swordsmen who had no understanding of magic to be a hindrance, and he thought it would be faster to progress alone than to progress through teamwork. In fact, Leo boasts that for every time he saves the world with his party, he could save it five times by himself. That's why he set out alone and saved the world alone.
Why Leo Wanted to Join the Demon King's Army
Leo defeated the Demon King Echidna and completed his roughly year-long journey. Upon returning to the holy city of Renaye, where the humans await, Leo finds no words of welcome or appreciation, nor any reward from the king. Instead, he is met with fearful voices: "A monster stronger than the Demon King," "A monster in human form," and "If you bare your fangs at us..." The people's response is to "Kill the hero!" The next day, numerous holy knights disguised as assassins and bandits are sent after Leo, and he begins a life of killing these rabble. Eventually, the Holy King himself orders him to be banished from the country. While wandering aimlessly, Leo hears rumors that the Demon King's army is recruiting. "If the world tries to kill me, I'll kill the world," Leo thinks. Believing that the only place he can be welcomed is the Demon King's army, he decides to take their recruitment exam. (He was immediately rejected.)
From Brave Leo to Sir Onyx
Leo explained his past experiences to the Four Heavenly Kings and somehow managed to get hired. However, since he didn't have Echidna's permission to hire him, he decided to hide his true identity and call himself Sir Godheart. As Sir Godheart, Leo helped Stina with her work. During this time, he struggled to decide what name to use—Sir Godheart, Sir Bloodsword, or Sir Onyx—but ultimately decided on Sir Onyx. Thus, only the Four Heavenly Kings know Leo's true identity. The rest of the Demon King's army (including Demon King Echidna) welcomes Sir Onyx as a new ally.
The Four Heavenly Kings' Instructor
After lightening Stina's workload and demonstrating his skill, Sir Onyx goes on to solve the problems of the other Four Heavenly Kings. First up is Lili, the Beast General who leads the logistics unit. Treated as an idiot, Lili is far from the type to lead her subordinates. Lili learns how important it is to work together with her subordinates, and succeeds in improving the efficiency of the logistics unit. Next up is the task of helping Shadowless General Melnes, who disappeared after leaving a note saying "I'm going on a journey," to improve his communication skills. She has him work as a waitress at a diner and practice for interviews, helping him to improve his communication skills. And finally, there's Edvard, the Dragon General. Edvard is the perfect example of a muscle-brained man, and he often takes it for granted that he can do it, which makes him too strict as a superior officer, leading to situations where his subordinates can't keep up. She teaches Edvard that "it's natural to have trouble with new jobs and enemies." In this way, the Four Heavenly Kings' work becomes more efficient.
Drinking Party Techniques
Leo used to be an expressionless, robotic honor student who wasn't good at communicating, but at a drinking party with Echidna, he shows off his technique for keeping his boss happy. He pours drinks for Echidna as soon as her glass is empty. This not only impresses her as a thoughtful person, but also encourages her to drink more and more, eventually getting her drunk. Knowing the food that will be served in advance makes it easier to expand the conversation. A question from his boss is the perfect opportunity to show off. During the video, Leo introduced techniques to make a difficult drinking party a little easier, such as informing people of a time limit (such as having to leave at a certain time) and making it easier to escape from a stressful drinking party.
Is Leo Really Over 3,000 Years Old? Leo Demonheart's Past
Although Leo appears to be a young man around 20 years old, he was actually born approximately 3,000 years ago. He was one of the 12 living weapons created as a countermeasure against the sudden appearance of the Demon King's army. The 12 are known as the Demon Heart Series, and Leo's real name is "DH-05-LEO," the fifth of the series. Each of the 12 had a special ability, but Leo was said to become the strongest of them all in the future. He specialized in self-improvement, and had the ability to analyze and analyse the abilities of his enemies as he fought them, and make them all his own (which is why he wasn't particularly strong in the beginning). In the end, it was thought that Leo was the only member of the Demon Heart Series to survive the battle with the Demon King's army...By the way, the Demon Heart Series exists in both male and female forms, and although they appear to differ in appearance, as they are merely weapons, there is no official gender, and although he tries to kiss Stina and is proposed to by Lili, Leo himself is not male.
The Real Reason Leo Joined the Demon King's Army
During his interview, Leo declared, "I wish to join the new Demon King's Army to destroy foolish humans and create a millennial kingdom for the demons!" However, his true reason was different. Upon learning that Echidna was seeking the Philosopher's Stone, Leo sought to confirm what kind of being Echidna was. If he thought she was worthy of the Philosopher's Stone, he would entrust it to her. After seeing with his own eyes what kind of being Echidna is and what she thinks, Leo decides to entrust her with the Philosopher's Stone. The Philosopher's Stone is the Akashic Engine, a device that is like Leo's heart, and in order to entrust it to her, he plays the enemy of Echidna and the Four Heavenly Kings, and deliberately destroys himself. All that's left now is to remove the Philosopher's Stone from Leo, which is as easy as opening a bottle. However, Leo's plan fails, and Echidna and the Four Heavenly Kings do not deliver the final blow to Leo, but instead inform him that they will officially welcome him into the Demon King's army, and Leo's once-in-a-lifetime plan ends in failure.
Summary of Former Hero Leo Demonheart
So far, we've introduced the story's protagonist, Leo Demonheart. What did you think? Some of you may have vaguely known that he's not an ordinary human, but who would have thought he'd lived for over 3,000 years... Now that Leo has officially become a member of the Demon King's army, we can't take our eyes off him.
