Description:
Thanks to various magic, the human race has been saved from calamity many, many times. Retaining his memories from his previous life, a boy, Shin, was picked up by an old man known to the world as the "Magi."
Shin was brought up by the Magi, who had retired to a secular place, as his own grandson. With the memories of his past life, he absorbed the Magi's craft and grew to be able to develop his own magic
Then, the grandfather told him he has to become independent when he reaches the age of 15.
"Ah, I forgot to teach him common sense."
The grandson who has grown beyond the level of normal people, lacked common sense; the common sense of the world. So to learn how to socialize, he goes to Earlshide Kingdom City to be admitted to Earlshide Advanced Magic Academy.
Yeah that synopsis sounds generic but I promise you it's good. There's the anime running this season as well.
As far as isekai goes, this is pretty basic. But what I love about this series isn't the isekai - it's the characters. The characters are pretty believable and surprisingly none are two-dimensional. This is a case of "don't judge a book by its cover" or "premise is dull but execution is great".
Character development comes slow but steadily, rather praiseworthy imo. The author transformed a boring premise into a fun and enjoyable isekai about a generic protagonist who gets more OP every chapter who is transformed to be memorable and charming by using a rich set of side and main characters who accompanies him everywhere. As he further breaks the balance of power of this new world, he and his crew progresses in their personalities and interactions in an attractive way that clicks with the readers. I really love well-written characters and this generic isekai has really sparked my interest which is why I'm putting it in this list despite having a 7.49/10 rating.
And one more thing: my favourite character here is the antagonist. Maybe I haven't seen enough to become the wiser but as of right now, this is by far the best-written antagonist I have ever seen. I'm talking strictly-antagonist, not first-antagonist-then-protagonist. It's hard to explain without spoiling so you'll just have to take my words for it. I'll sum this up into two parts: backstory-antagonist, and present-antagonist. Backstory-antagonist tells the story of how he turned into the villian of the story; how he started out like the protagonist and you and me, normal people - that's what you would think. He was much more than normal, which further dramatizes his transformation to become the villian. He was supposed to be the protagonist of his story but was forced to become the villian by circumstances that he did not deserve a single bit. Present-villian is very simple and relatable, he have one goal and nothing else, in fact, a lot of the conflicts in the latter chapter are run by his underlings rather than himself (not a spoiler) and even this transition of source of conflict is taken care of steadily and with wisdom.
TL;DR
This manga has great characters which make its generic plot actually very fun. Give it ten chapters.