This is spoiler if you dont want to read this pls leave ty☺

Publisher's Summary

Iruma-kun, a pitiful boy sold to the devil by his parents' selfishness. Should I be with someone with a devil who does not have grandchildren and will do I have to go to the devil's school?!

Chapter 1

Iruma being sold off by his parents

The story begins with the introduction of Iruma Suzuki, a 14 year old boy. He is described as being very kind-hearted, and unable to deny anyone a single request, regardless of how difficult or ridiculous it is. However, because of this, he often finds himself in dangerous situations, and lives a difficult life.

Growing up, Iruma found himself in dangerous situation after dangerous situation, as his parents are selfish, mean people with little to no common sense whatsoever. However, they finally crossed the line when they accidentally summon Lord Sullivan, a demon, and sell their son in exchange for money and wealth.

Lord Sullivan immediately began spoiling him

After being sold, Iruma fears for his life, until the demon presents him with expensive food and clothes, and explains the real reason he bought him. Lord Sullivan explains that he never got married or had children, but desperately wants a grandson, because his friends always boast about their grandchildren. Iruma tries to refuse, but is swayed by Sullivan's begging, and agrees, stamping a contract. Sullivan hints that, if Iruma had refused, he may have simply eaten him instead.

Lord Sullivan declares that he will spoil Iruma and provide him with the best of everything. However, that also means that he will have to go to school, especially since Iruma never had time for proper study after living such a difficult life, and dragged around by his selfish parents. Iruma is given a uniform (his standard outfit) and enrolled at Babylus Demon School; he learns that he is the first human to enroll, and that he has to keep his real identity secret, lest he be eaten by demons.

Iruma arrives at orientation at learns that Lord Sullivan is, in fact, the Principal of the demon school. In his pride for his grandson, Lord Sullivan boasts about him on stage, to Iruma's horror, and even presents a poster. He then removes the Freshman representative, Asmodeus Alice, from the stage and declares that Iruma will instead make the speech.

Iruma's terrified demeanor is mistaken for confidence by the students; once on stage, he decides to read the words prepared for him on a piece of paper on the podium, in lieu of a speech. This causes an uproar, and it is revealed it was a forbidden spell that would have blown his limbs off if mispronounced. It is revealed that the effect of the spell is that he will not fall at all, no matter what, for the entire day.

Iruma wins with an impressive (if accidental) German Suplex

The freshman representative challenges Iruma to a duel immediately after the orientation and summons the student body to watch the fight. Due to his difficult and crazy life, however, it is revealed that Iruma can dodge anything, and has "0 attack, infinity defense. For better or worse, a completely harmless person." Iruma dodges Alice's fire magic for 20 minutes, before tackling him to save a nearby student. The effects of the spell from earlier activate to stop him falling, and Iruma defeats Alice in an accidental German suplex.

Iruma becomes the most talked about 'demon' in the school, and later Alice arrives to congratulate Iruma on his victory. As per demon custom, he now follows Iruma and serves under him. He swears they will dominate the school together, to Iruma's surprise.

Iruma begins his first day at school, and attempts to tell Lord Sullivan that he doesn't want to go to Demon School because he's scared of being eaten. He is unable to, however, as he is showered in gifts and praise, and feels bad ruining such a happy atmosphere. The demon servant, Opera, is passively introduced in the background, bringing gifts.

Chapter 2

Attending school, he is greeted cheerfully by Alice, and told the first lesson of the day was summoning a familiar, and that a students rank will be determining by measuring its strength.

Naberius Kalego enters, and announces himself the teacher of the class, and quickly explains how to summon a familiar, including that a familiar cannot harm its master. He makes it clear that he believes Iruma is relying on the favoritism of his 'grandpa', the principal.

Iruma's familar is...Kalego-sensei?

Asmodeus summons his familiar, a Gorgon Snake, while Kalego broods over how Iruma and Sullivan act so similar, and how Sullivan has been treating him unfairly. He plots to expel Iruma the moment he makes any mistake in the summoning ceremony as revenge. Unknown to him, Iruma also plans to mess up the summoning due to his lack of magic, and hopefully get himself expelled without confrontation.

Kalego turned into a chick.

However, as the summoning ceremony for a demon summoning a familiar and a human summoning a demon for contract are the same, Iruma accidentally summons his teacher, Naberius Kalego, and forms a contract, turning him into a tiny chick.

Later, Sullivan reveals the contract will last for 1 year, and ending it prematurely will cause both of them to die. Iruma becomes more notorious as rumors of him enslaving a teacher as a familiar. 

Chapter 3

Iruma, Asmodeus and Clara have fun together

Iruma and Alice are walking down the hallway after collecting their class lists and materials for the year, when a demon rolls past them at speed, crashing into a pillar, and destroying it. Iruma is concerned, and goes to check on them, meeting Valac Clara. Alice issues a warning not to talk to her, that goes unheeded.

Clara is unharmed and delighted to have a new person to play with, startling Iruma with her enthusiasm. She introduces her right foot as Connor, and her left foot as Murph, before enthusiastically inviting Iruma to watch her crash into more columns. Alice explains that Clara is another 'weirdo', and that people avoid her because she will get them into trouble. However, Iruma finds himself dragged into her antics immediately, unable to refuse and swept along with her fast pace. The three play house for two hours straight, leaving the two boys exhausted. Clara offers them snacks and drinks, and introduces her inherited magic; she can create anything she's ever seen before.

Iruma (and Alice, reluctantly) continue playing with her for several more days. Clara seems extremely happy, humming and laughing as she goes to meet with her new friends every day.

Iruma and Clara have a heart to heart

On the way there, Clara overhears several demons sitting on some stairs. It is revealed that some demons take advantage of her power, extorting drinks and other items from Clara in exchange for their 'friendship'. Though Clara is rather ditzy in nature, she admits to herself while walking away that she knows that, without her power, people wouldn't bother playing with her.

Once she meets up with Iruma, she begins to shower him with snacks, drinks, and whatever she can conjure, saying "You can have them all! I'll give you anything you want! So please, keep playing with me...". Iruma quickly refuses the gifts and apologizes. Clara, panicking, begins to cry. She explains that the snacks are her 'nuisance fee' and that Iruma would leave her like everyone else, now that he's bored.

Clara performs an excellent takedown using a vending machine

Iruma explains that he doesn't need the snacks, and that he'll keep playing with her anyway, because playing with Clara is fun. He explains that Clara does go overboard sometimes, but that's because he's not used to playing. Clara begins to laugh and cry, happy someone wants to continue playing with her even without being bribed.

Yocchan and his friends came down from the stairs and appears before them, once again demanding drinks from Clara, with a very condescending sneer. With Clara lifting her insecurities and realizes she wasn't a burden all along with Iruma, she instead conjures an entire vending machine, crushing the leading demon beneath it, telling them to insert some coins if they want anything. Iruma covertly asks Alice to make sure no one else will take advantage of Clara again, which he does so (though the bloodstains on his coat implies he went overboard) and made absolutely sure Yocchan and the others woudn't bother her anymore.

Alice and Clara come to pick up Iruma in the morning on their way to school. Sullivan comments that he's happy that Iruma has managed to make two new friends so quickly. Iruma freezes, initially denying being friends, and even questioning if demons and humans can even be friends to begin with. It is also revealed that Iruma has never made a friend before, and doesn't know how one should go about making them.