Makai Ouji: Devils and Realist Series by Madoka Takadono, Utako Yukihiro

William Twining is blessed with both brains and wealth. He attends a prestigious school and lives in a huge mansion with his uncle and butler. But when his uncle's business endeavours fail, the Twining family is left bankrupt. While searching in a storeroom of his home for objects to put up for sale, William stumbles upon a secret room. This room contains a magical seal, with which he unintentionally summons a demon... moreWilliam Twining is blessed with both brains and wealth. He attends a prestigious school and lives in a huge mansion with his uncle and butler. But when his uncle's business endeavours fail, the Twining family is left bankrupt. While searching in a storeroom of his home for objects to put up for sale, William stumbles upon a secret room. This room contains a magical seal, with which he unintentionally summons a demon. This demon, Dantalion, tells William that he wields sole authority in selecting the "substitute ruler" of the demon world! So naturally, the candidates for the throne will pursue the bewildered and annoyed young man... less

Demons Dantalion and Sytry insist they will not leave William's side until he crowns one of them as king. In the meantime, other forces conspire to meddle in William's life, dragging him through Hell and back -- literally. On top of everything else, it appears Stradford School may be haunted! Can a realist learn to live with the supernatural?

When William Twining's butler Kevin abruptly takes over as campus pastor, William can't understand why he's suddenly getting the cold shoulder. Meanwhile, a political conspiracy is brewing, and the Church is rallying to uncover the demonic possession of a member of the British government. All hell breaks loose when William stumbles upon a secret government conclave! As the battle for his soul heats up, can William possibly live a normal life?

As the vessel for Solomon's soul, William has the task of choosing who will be representative king while Lucifer, the emperor of Hell, sleeps. William's days are spent avoiding the persistent demons who vie for stewardship of Hell. But when Heaven learns about the search for the king of Hell, it's time for the angels to swoop in!

When William Twining puts on a ring that's an old family heirloom, he regains Solomon's consciousness. His ancestral memories are restored, with one strange exception -- he has no recollection of Dantalion! What could have caused this strange memory lapse?

William undergoes special training in magic under the instruction of Mathers. At the same time, the War of the Roses begins at the school. Unable to compete effectively, William suffers humiliating defeat in every event. Who will win -- the Red Rose Army, or the White Rose Army?!

William Twining has it all-a sharp intelligence, dashing good looks, and a noble station in life. There's only one problem: he's broke. With no way to finance his prestigious education, William decides to search through his uncle's mansion for something of value to sell. But William's logical worldview is about to take a hit, when he comes across a mystical seal which he unintentionally uses to summon a demon... moreWilliam Twining has it all-a sharp intelligence, dashing good looks, and a noble station in life. There's only one problem: he's broke. With no way to finance his prestigious education, William decides to search through his uncle's mansion for something of value to sell. But William's logical worldview is about to take a hit, when he comes across a mystical seal which he unintentionally uses to summon a demon.The demon's name is Dantalion, a Grand Duke of Hell, who informs the young nobleman of his destiny-that he is the new "Elector" whose sole responsibility is to appoint the next ruler of Hell in place of Lucifer. Such news might drive a lesser man mad, but not William Twining. He's a realist whose views don't allow for the existence of demons, even when scores of demonic candidates begin to knock down his door and seek his favor. None of this can possibly be real-can it?-and besides, he's got bills to pay. less

William Twining has it all-a sharp intelligence, dashing good looks, and a noble station in life. There's only one problem: he's broke. With no way to finance his prestigious education, William decides to search through his uncle's mansion for something of value to sell. But William's logical worldview is about to take a hit, when he comes across a mystical seal which he unintentionally uses to summon a demon... moreWilliam Twining has it all-a sharp intelligence, dashing good looks, and a noble station in life. There's only one problem: he's broke. With no way to finance his prestigious education, William decides to search through his uncle's mansion for something of value to sell. But William's logical worldview is about to take a hit, when he comes across a mystical seal which he unintentionally uses to summon a demon.The demon's name is Dantalion, a Grand Duke of Hell, who informs the young nobleman of his destiny-that he is the new "Elector" whose sole responsibility is to appoint the next ruler of Hell in place of Lucifer. Such news might drive a lesser man mad, but not William Twining. He's a realist whose views don't allow for the existence of demons, even when scores of demonic candidates begin to knock down his door and seek his favor. None of this can possibly be real-can it?-and besides, he's got bills to pay. less

Kevin has been monitoring William for years, overseeing the growth of Solomon's reincarnation and the one destined to determine the futures of Heaven and Hell. But with his identity now revealed to be Uriel, the Angel of Repentance, what will William do about his faithful servant? Loyalties are tested and decisions made, as William's most treasured ally is revealed as the greatest possible threat to his very soul...

Baphomet has been Dantalion's most trusted retainer for hundreds of years. In fact, he's been the nephilim candidate's only retainer. But, after nearly half a millennia of tireless service devoid of demonic slumber, Baphomet must finally rest. With his goat-headed servant nearing the end of his life, will Dantalion have any choice but to be separated from him forever?

The fate of Dantalion's retainer Baphomet has been sealed thanks to the scheming of the demon Baalberith. Without the support and companionship of his oldest friend, can Dantalion hold onto candidacy of the throne, or are even William's words not enough to sooth the broken, rageful heart of a Grand Duke of Hell?

"THIS IS WHY HE GAVE UP ON YOU."Having lost his sole retainer, Dantalion throws himself into the battle to succeed Lucifer. But the appearance of a powerful new ally at his side foretells a risky new tactic. With William distracted by the ongoing conflict between his scientific beliefs and the existence of the supernatural, the battle for Hell takes a demonic turn...

One cold winter's night, Dantalion appears and tells the tale of his own past -- thus sparking Solomon's true self to life! In the blink of an eye, the battle accelerates, thrusting angels, demons, and humans alike into the fray. But in the midst of all this, William has a decision to make -- which side will he choose?!

Heaven, Hell, and Earth are on the verge of war, the Four Horsemen are riding their deadly steeds, and the root of all evil is seeking shelter in William's home! Amidst the rising turmoil and the arrival of unexpected guests, William begins to uncover the secrets of Solomon's ring -- and with it, the secrets of his family's dark past.

“I WILL SAVE YOU…ALL OF YOU.”William has descended into Hell! The truth about Lucifer will soon be revealed―as will the fate of William and all his friends. The hour of reckoning has arrived in the final volume of Devils and Realist!