That is why RaGF sells out and has such a huge following from casual readers.
People can relate to the base plot.
And it is not a simple story. There is nothing simple about it.
Its pretty complex, and the Mangaka has the heavy task of incorporating 5 women into the story with full backgrounds.
One girl even has a spinoff manga.
Also, when have you ever read a Harem comedy where the girls dont know each other?
That creates complexities in itself because Mangaka has to figure out how much screen time each one gets.