Because no one else wrote a review for this series yet, i thought of writing one myself.
So far, so good.
There hasn't been much information brought to us about Academy City's number 2 esper: Kakine, Teitoku (In the animes at least); and to see a manga about him is extremely exciting yet very interesting. Having this series start not too long ago (August of 2019) and the first volume just released in March 26 of this year, it makes sense how its not well known yet. But so far, its good. The story has similar elements to the accelerator manga. Also, please keep in mind that you have to have at least watched a season of index or a season of railgun to know whats going on just like the accelerator manga and anime.
I won't go too far into the depth of the story because it'll be much easier to read all the chapters for yourself, but so far the chapters are interesting. The art is superb. It's much better than the accelerator and railgun manga. Having more details and better shades that fit the mood of the manga is done perfectly. Like accelerator, Kakine is cold hearted (Or WAS for accelerator) and now is taking care of a mysterious loli named Yuzuriha, Ringo. Seeing the fragments of Kakine's past is by far the most interesting part of the story and seeing the loli's character and what happened to her in the experiments are also worth reading and paying attention to. Not much has been said about the other members of SCHOOL but Kakine's and the loli's past is enough to persuade me to read on. Overall it's interesting and i think you should give it a try. And yes, its after Accelerator has been shot but takes place before the battle royale arc.