My Senpai Knows Magic

This is a world where science and magic coexist. Some people here seek powerful magic, and some seek eternal truth. A science tyrant who came from another world, started as a little librarian, with magic in his left hand and truth in his right, kicking the door of the new century with one kick. Some people call him the forerunner of magic, some say he is the founder of science. Some people describe him that way. In the new century, Blair is a symbol of evil. - Description from novelcodex.org