Demon Kings

Haruka, an employee for a real estate company, is lamenting about her mistakes at work as well as her unrequited love with a senpai who recently got married when a "meteor" suddenly hits her window. The suspicious man who fell from the sky is the self-proclaimed demon king?! He then proceeds to tell her that in her previous life she was the saint, which makes him her archenemy... like hell anyone would believe something that sounds as if it came from a light novel! Then he declares, "I'll make you happy, and when you've regained hope I'll plummet you into despair!" Corporate slave who was a saint in her past life x demon king, the story of their cohabitation as the demon king becomes a doting lover. (Source: Mangaupdates) -

In a dilapidated castle, Astaroth awoke as a Demon King. With his ‘wisdom from his past life,’ he would rule over his lands as a thorough ‘realist.’ “Demon King, why are you attacking the level 1 Heroes?” “Defeat them before they become stronger. That is called strategy.” “Demon King, why are you sending fake money to the enemy country?” “To bring chaos to their economy so they will self-destruct.” “The werewolf troops have attacked. Should we use silver bullets?” “Not bullets, shoot them with canons.” And like that, Astaroth ‘reformed’ the old tendencies. He became a lord who was loved by the people and his subordinates, and he would go on to be called the most powerful Demon King in history.

Rick, an alchemist who was banished from the strongest heroes' party, is wandering the wilds alone, when he saves a beautiful woman. It turns out that she is a dungeon spirit! Rick makes a contract with her and becomes the dungeon master. Now he is determined to create a dungeon that will defeat all the heroes!

Reborn as a Doomed Demon Lord But I'm a Full-Strategy Streamer!The top gaming livestreamer suddenly wakes up as a powerless Demon Lord with zero combat ability! Want to unlock cheat powers? First, he has to defeat his own subordinates. But with no strength not even enough to beat a chicken how can he turn the tables and survive in this brutal world?

Danterio, the “kind Demon King” who once saved the world from an angelic invasion, fights a final battle and then loses consciousness. When he next opens his eyes, he finds himself years in the future—in modern Japan—reborn in the body of a young man named Daiya Mizukami, who died from bullying and an overdose of magic‑enhancing drugs. Learning of Daiya’s bitter regrets, the Demon King first deals with the problem right in front of him: he crushes the bullies who drove Daiya to his death in an instant. But when he looks at the wider world, he discovers that magic has weakened, and the angels he once defeated have begun to move again. “I am the Demon King, Danterio. I will teach you… how to kill angels.” Thus begins a modern battle‑action story where the strongest Demon King rampages through contemporary Japan, combining reincarnation, school life, and brutal angel‑slaying action.

The Demon King's reign, known as the "Demonic Invasion," lasted for centuries, and countless heroes were defeated by the Demon King without any means to overcome him! However, the Demon King was finally slain by the hero Therios, known as the Last Hope. The world achieved peace, and the hero Therios disappeared somewhere--. But the Demon King, who was said to be dead, is revived by a miracle! As a dog...!? This is the story of the last Demon King, now fluffy, protecting his granddaughter, who is targeted by the entire world, and earnestly wishing to live in peace--.

The story kicks off with the Demon King running away in the face of the enemy! The 6th Demon King, Ilvizora, was supposed to be quietly waiting for the final showdown with the Hero. That was how it should have gone, but the Demon King panicked and ran! The Demon King who fled from the Hero then encountered a young girl who has never know freedom. As the Demon King makes his way along a long sprawling labyrinth-like journey, the yearnings and ideals that stir his otherwise unremarkable heart quietly begin to change the world the two of them share. A life-or-death game of tag between a cowardly Demon King and the strongest Hero begins now!!

Shin, Akie, Yuki and Dim-Dim explore some ruins when they stumble upon a place with unusually strong magical protections. After defeating the golems guarding the entrance, they find a strange child sleeping alone in a bed... Horihone Saizou's second attempt at a G-rated, family friendly, mainstream-compatible manga following KURO AND MARCO from 2009. Serialization began in the November 2025 issue (#28) of ISEKAI HAREM.