is a Japanese light novel series written by Tsuyoshi Yoshioka and illustrated by Seiji Kikuchi. It began serialization online in January 2015 on the user-generated novel publishing website Shōsetsuka ni Narō. At the beginning of episode 311, in November 2022, it was announced that episode would be the last posted on Shōsetsuka ni Narō. It was acquired by Enterbrain, which has published seventeen volumes since July 2015 under their Famitsu Bunko imprint.
A manga adaptation with illustrations by Shunsuke Ogata began serialization on Kadokawa Shoten's Young Ace Up website in March 2016. It has been collected in twenty-nine volumes.
An anime television series adaptation by Silver Link aired from April to June 2019.
Plot A young salaryman who died in an accident was reborn in another world filled with magic and demons. As a baby, he was picked up by the patriot hero "Sage" Merlin Wolford and was given the name Shin. He was raised as a grandson and soaked up Merlin's teachings, earning him some irresistible powers. However, when Shin became 15, Merlin realized, "I forgot to teach him common sense!" Diseum, king of the Earlshide Kingdom, recommends Shin to attend his Magic Academy, on the condition of not using Shin for political warfare. In the capital, Shin rescues two girls, Maria and Sizilien, from thugs, and later he inaugurates a club that consists of him and others.
Characters Ultimate Magic Research Society
A Japanese salaryman who worked for a science textbook publisher was killed by a truck and reborn into another world with his memories intact. Upon arriving in the new world, which was full of magic, he was raised and trained by Merlin Wolford, Melida Bowen, and Michel Collins, thereby making his magical and combat skills beyond S-rank. Shin can also create and modify magical gear to what can be considered National Treasure–level equipment. Being raised in the woods, however, his social and worldly skills are a bit lacking, though only by the standards of his new world. He has the leadership of his own Ultimate Magic Research Society and effortlessly tops S-rank. Sicily was enamored with Shin from their first meeting and is overjoyed when she becomes his fiancée. Like his grandfather, Shin can cast magic without verbal or somatic components (since he considers spoken spell names embarrassing) and has created many unique spells like the gate and extra-dimensional storage spaces. His element compresses in water and heat, and his strongest attack is the Hydrogen Bomb. Based on the recollection of his previous world, Shin's knowledge of science and astronomy revolutionize the world's magic tools. Over the summer break, Shin and his grandparents perform intensive training with the Ultimate Magic Research Society to prepare for massive demon outbreaks while deployed in a special unit called the Ultimate Magicians, hopefully, to prevent other academy students from getting conscripted into war. Soon afterward, Shin's (Earth-modern) appliances prompted him to open his own shopping mall. Years later, Shin and Sicily would have a daughter named Charlotte alongside her adoptive demon-hybrid brother, Silver. His title is Demon Lord, which he does not like.
The son of King Diseum and invested as the crown prince, he also goes by "Aug" or "Gus" to his friends. He is respected by his peers and, like his father, considers one's abilities to take precedence over their peerage, but does not use his influence unless necessary. Aug inherited his father's traits. Shin and Aug have a cousin-like relationship. Aug enjoys watching when Shin gets in over his head during social actions and likes to tease Shin to act on his plan. He also keeps Shin prudent from introducing new magic and tools that would throw the world out of balance. Aug's childhood friends, Julius and Thor, feel pressured because he talks to Shin casually. Even Elizabeth is irritated by their closeness until Aug eases her mind when he provokes Shin to confess to Sicily. He felt absolute fury when a corrupted Pope dared to come between Shin and Sicily. August and Elizabeth soon wed following Shin and Sicily's. Aug still kept tabs on anyone who saw his best friend's unbalanced power as a threat. He acquired the title 'Thunder God' after electrocuting a giant crocodile and is the 2nd S-rank.
A red-haired second daughter of a Countess and is a friend to Sicily. Maria is a very upfront and vocal lady; she is also an obsessive fangirl of Merlin and Melida. She teases Sicily over her crush on Shin and tries to offer her support in their relationship. Due to her indifference, Shin does not treat her like a nobleman's daughter. Her title is Valkyrie and is the 3rd S-rank. She does not like her title, as it implies she will be a virgin for the rest of her life and never get married.
A beautiful, timid, soft-spoken girl with waist-length blue hair who is called a Saint, and is the third daughter and fourth child of the Viscount Claude, who works at the Finance Bureau. She gets her looks from her mother. Her eldest sibling is her brother Royce, the heir presumptive of the noble house, along with her two sisters Cecilia and Sylvia, who both work for the Royal Magic Division. Sicily is unassuming with what many consider the loveliest features. She is smitten with Shin the first time she meets him after he rescues her and Maria from a group of thugs. As she and Shin started going out, she tended to be a little aggressive towards him and others. Sicily excels in healing magic, and thanks to Shin's tutoring, her forte is now only second best to Shin's. She is the 4th S-rank and received the title 'Holy Maiden' for being a savior of Swedes Kingdom civilians, increasing her popularity, including her and Shin's engagement. She's now targeted by Zest and his scouts, as she is deemed to be Shin's weakness. After the demonoid arc, Sicily happily married Shin at the Gospel Cathedral and adopted Silver as their own son (hiding the fact that it's Schtrom's).
A perky blonde girl who has an upbeat, yet childish, personality, and her father is an accountant of the Hague Company. Despite being considered an adult (15) Alice is also the smallest physically. She is marked 5th S-rank. Alice's father accepted the position of President at the Wolford Company. After seeing many of her friends getting impressive titles, she asked for one as well, she got one, and it is called 'Eradication Magical <Petite> Girl', a title which she does not really like at all.
A childhood friend of Prince August and acts as one of his escorts with seriousness. Thor has silver-colored hair and eyeglasses. He is the eldest son of a Baron. Thor longs to be knighted, though some people are puzzled by his appearance. Initially, he and Julius do not chat equally with Aug, until seeing him and Shin interacting without any care of their status, and gains more confidence over time. His fiancee is comedically much taller than him, but they have a close bond. He is marked 6th S-rank. Julius mentions that during Thor's younger years, Thor was often mistaken for a girl, something that causes him a great deal of embarrassment.
A petite girl who is slightly taller than Alice and sporting glasses, her father is a court magician. Lynn is excited to gather magic when it comes to Shin's tutelage. Due to her uncontrollable magic, Shin dubs her the "Unbridled Magical Girl", something she appears to be delighted with, though it wasn't a compliment. Given the name, she is marked as 7th S-rank.
A curvaceous figure student whose family runs an inn. She is personally taught by her idol Melida, making her hailed as the "Guru's Successor". Yuri dresses in her shirt, which hangs loosely and slightly exposes her large breasts. While not spoken, her risqué dressing manner implies Yuri is "experienced"; backed up by the fact that she didn't bat an eye at Olivia explaining how to tell if a girl recently lost her virginity. Her specialty is Enchantment magic. She is marked as 8th S-rank.
A handsome boy from a family of knights; however, he decided to attend an academy for magicians. Tony is a laid-back person who usually just goes with the flow. He does not respect the environment of knights and is more interested in flirting with girls. He chose to attend the Magic Academy over the Knight Academy due to the larger number of girls at the Magic Academy. However, he settles on a serious girlfriend, having earned her respect and affection, after ditching the playboy routine. Tony is one of the few magicians who excelled in swordplay other than Shin. He is marked 9th S-rank. He acquired the title 'Knight Magician' after he defeated a giant demon deer with magic and swordsmanship.
Also a childhood friend of Prince August and serves as his escort along with Thor. Julius has a muscular body and is the eldest son of a Duke. His relationship with Aug is similar to Thor's and changes afterward. Julius also speaks in a samurai tone that Shin mistakes him for a real knight until he invites the whole group to his family beach resort. He is marked as 10th S-rank.
He is a sporting boy being in a family that works as blacksmiths. Mark is Olivia's boyfriend. He is good friends with the S-class regardless of being a newcomer. His father is a strict man who keeps his staff organized, although he immediately results in politeness to the nobility, such as August or Shin. Mark is willing to implement Shin's ideas of inventing detached swords and wireless communication devices empowered with his manmade gem stones. Originally an A-class student, he qualified to be in Shin's club by making an inter-dimensional storage space. Mark's magic has improved so much from Shin's tutoring that he and Olivia are officially placed in the S-class, ranking 11th and 12th, respectively.
She is an attractive lady whose family runs a popular restaurant and is Mark's girlfriend. Olivia started as an A-class student along with Mark. She and Mark are the only other students in the Academy able to create an inter-dimensional storage space, thereby being able to join Shin's club activity. Olivia and Mark have since been upgraded to S-class due to having improved their magical powers. She is the only member of the Ultimate Magicians to lack a title, reflecting how Olivia doesn't stand out. However, she is the easiest one to meet, when serving customers at her restaurant.
Supporting characters
The Wise Man and adopted grandfather of Shin. A hero of the Kingdom whose magic and skills are considered legendary especially when he and Melida (whom he was married to at the time) slew the Demonoid king. Everywhere they go they have rabid fans pursuing them and are considered the epitome of greatness. However, while teaching Shin magic and combat, his training in common sense and otherworldly events was a bit sparse.
The Great Guru and ex-wife to Merlin. Melida helped raise Shin and taught him the skill of gear creation, being one of the greatest creators of all time. While stern, she cares greatly for Shin and is always amazed when he does something inventive; if not angered, as Shin has a tendency to do things without thinking about them responsibly. She also is working to teach Shin some common sense and ensure he is not taken advantage of.