Can Sky train up his magic so he can go from a laughingstock to the most powerful wizard in the world with a harem at his knees?
The premise is not overly original, but it would be nice to have someone that doesn't start OP.
Now, on the other side, why is there always a need for a harem? This trope is way past the realm of "cliche" by now.
Just a piece of advice to writers: you don't need a harem to make a good and/or popular manga. For proof of this, look at just nearly any manga or anime that have been around for a long time.
Then again, if that is what you
really want to write... 😒