This Is Really Science

He unexpectedly gained the ability of a mysterious master. He was once a mathematical genius, but now he has become a sage in the eyes of others. However, whenever someone asked him why he became a magician, his answer was always "It's really science." Is this really science? This is really science. This is really science! (Relaxing and everyday, the plot is bland, not too much pretentiousness, purely urban, single female protagonist.)