Welcome to Demon School, Iruma-Kun is an anime and manga series created by Osamu Nishi and can be accessed on various streaming sites, including Netflix.
The series follows the journey of Iruma Suzuki, a human boy who is traded by his parents to a demon and later attends a demon school where he makes new friends and learns about the demon lifestyle. Since its release, the series has gained significant popularity among audiences.
For anime enthusiasts who are searching for a fresh show to watch, be sure to check out Welcome to Demon School, Iruma-Kun on Netflix or other streaming sites. And for those of you who are already fans of the series and are just curious about the anime, be sure to read on to discover some fascinating facts about Welcome to Demon School, Iruma-Kun, that you probably didn’t know.

1. Iruma’s Name Is Connected to Being a Human
The name “Iruma” has a clever connection to the Japanese spelling of Iruma, which is 入間. It is strikingly similar to the Japanese spelling of “human,” which is 人間. This play on words is a clever way to emphasize Iruma’s unique situation as a human in a world of demons.

2. Alice’s Name Means “The King of the Demons”
While for Alice, his name is from a powerful demon known as Asmodai, who is often referred to as “the king of the demons.” This figure has been depicted in various religious and mythological texts as a powerful and seductive entity that tempts humans and angels into sin.

3. The Letters and Ranking of the Series Is Based on the Hebrew Written Language
In the series, the demon world has a unique and intricate system of communication and hierarchy. One interesting aspect of their culture is the use of a written language based on an alphabet that incorporates Hebrew letters. This alphabet is used for written communication throughout the demon world and adds a unique and mysterious aspect to their culture.
In addition to the written language, the ranking system for demons is also based on a numerical system called “gematria,” which corresponds to Hebrew letters with specific numbers.

4. Sullivan Is Not Actually a Yodh-Ranked Demon
During a meeting at the thirteen’s dinner, it was revealed that Sullivan, who is one of the Three Excellencies and widely known for his immense power, is not actually ranked as a Yodh demon.
Despite his abilities being suitable for the highest rank, As it turns out, Sullivan prefers to stay at rank 9, despite his overall ability being suited for the highest rank. This decision is partly due to the fact that if he were to become an official Yodh demon, he would be expected to take on the role of the demon king. By staying at his current rank, Sullivan can continue to use his abilities to support Iruma as his grandchild without the added pressure and responsibility that would come with being a Yodh-ranked demon.

5. Opera’s Ears Change Depending on Their Mood
In an episode of the show, Iruma had a conversation with Alice and Clara about Opera’s ears. He explained that the state of Opera’s ears could indicate their mood. Specifically, when Opera’s ears are droopy, it means that they are feeling upset or unhappy. On the other hand, if Opera’s ears are pointed up, it means that they are feeling happy.

6. Naberius’ Favorite Hobby Is Taking Care of Cacti
In episode 12 of season 2, viewers get to learn more about Naberius Kalego. During a home visit with one of his students, Clara’s mother inquired about Kalego’s interests. It was then revealed that Kalego has a fascination for cacti and even collects and cares for them in his free time.
7. Kirio’s Favorite Food Is Lightly Seasoned Tofu
In a tweet from the author, readers can learn a small but interesting fact about one of the characters. Specifically, the author mentions that Amy Kirio prefers lightly seasoned food. The author gives the example of tofu as a food that Kiriwo might enjoy due to its mild flavor.

8. Every Man Is a Potential Love Interest for Elizabetta
In the harvest festival arc, viewers are provided with an interesting insight into the character of Elizabetta. Specifically, it is explained that for her, every man is a potential love interest. This detail adds an intriguing aspect to Elizabetta’s character, as it suggests that she has a very open-minded approach to romance.

9. Alice Has “Ichthyophobia”, or a Fear of Fish
In the 23rd episode of Welcome to demon school, Iruma-kun titled “You Fit Right In Now,” Alice is trying to think of a meal to cook for Iruma when one of his butlers suggests cooking seafood, holding up a large fish known as “Demon Maguro.” Alice becomes visibly shaken by the sight of the fish and tries to walk away, but he remembers Iruma and decides to face his fear and try to prepare the fish. The butler notes that Alice has been afraid of fish since he was a child.

10. Alikred Spelled Backward, Is the Demon King’s Name, “Derkila”
The character representing the Ring of Gluttony is named “Alikred,” and the name of the Demon King, “Derkila,” is simply Alikred’s name spelled backward. Shinichiro Miki, the Japanese voice actor, provides the voices for both Alikred and Derkila. Due to these connections, fans have developed theories that suggest that Alikred and Derkila could be the same demon.

11. Balam Loves Cute Things and Picture Books
In the tenth episode of season 2, it is revealed that Balam has a great passion for children’s picture books, which he has turned into a hobby. He demonstrates this hobby by creating a series of picture books for Iruma to study in preparation for his exams. Additionally, Balam is shown to have a strong affinity for all things cute, which further adds to his endearing personality.

12. Blushenko Has a Scar Despite Having Healing Abilities
Chapter 58 of the manga shows a panel that Buer Blushenko possesses a bloodline that allows him to heal quickly from any injury as long as he has access to mana, essentially rendering him almost immortal. However, despite his incredible healing abilities, Blushenko has two noticeable facial scars on his right cheek, indicating that there was an instance where he sustained a significant injury that his healing power was unable to repair fully.

13. The Babylus Demon School Has Precisely 666 Students Enrolled
At present, the Babyls School in the anime and manga series has a total enrollment of 666 students, with each grade level accommodating a certain number of pupils. The significance of this number cannot be overlooked, as it is frequently associated with the devil in popular culture.
Read more: Welcome to Demon School! Iruma-kun Season 3 Trailer Released

More Facts About Welcome to Demon School, Iruma-Kun
Volume 21, chapter 186.1, The special character booklet of “Welcome to Demon School, Iruma-kun” provides readers with a variety of fascinating facts about our favorite characters, including:
- Opera was initially designed as a background character with no dialogue, serving only as Sullivan’s humanoid pet cat.
- Iruma’s original design had a much more confident demeanor, with his lines being much more assertive. However, the concept was later altered to create a less energetic and more reserved Iruma.

- The first concept art for the characters in 2017 showed Alice with blond hair and Clara with pink hair that was intended to complement their school uniforms.
- Valac is commonly depicted as a demon who rides a two-headed dragon. Initially, Clara was also supposed to ride two dragons, taking inspiration from Valac. However, to maintain the balance between the characters, the author decided to change Clara’s mode of transportation to slippers.

Bonus!
How to summon a familiar based on Sullivan
- Draw a circle using your blood on a piece of parchment.
- Stand inside a mandala with the parchment.
- Hold the parchment over a candle in the center of the mandala.
- Then your familiar will appear!