@johnpoop2529 Pretty sure the majority of the Harem mangas are what you are asking for: All the girls falling in love with one guy.
Whenever other male appear, usually it already had a lover, is too young/old to get any of the main girls, or is used as a comic relief.
If anything, stories like Arifureta only got to have a 'secondary ' MC type character because of how heavily critizied they got about a single male getting all the girls.
Or at least that is how I always see it.