I have been wondering of why there's not a lot of Female sumo manga, I figured the rules of it being a man's sport keeps the idea that women don't practice it. I did read how there were female sumo wrestlers and in some cases it being the equivalent of mud wrestling/foxy boxing, figured not a lot of mangaka know this, nor do they wish to use it as they probably aren't interested in the sport and feel it would be weird to sexualize it in such a way.
I figured that since the perception of the sport is men only, no creator would figure an audience would be interested in a story of female sumo wrestlers as it would feel weird to get off to it. Even if it's justified as taking place in an alternate world, future or another country.
I also figured the set up of how the wrestlers train and live keep it from being used as the wrestlers have to live and train together and the no girls allowed rule, makes it hard to do stock ecchi/harem plots. The protagonist can't be a nerdy everyman if he's also a sumo wrestler. The no girls allowed rule makes it hard to justify everyman surrounded by beautiful women or beautiful women getting into sexy scenarios. I also figured the build and lifestyle of a sumo wrestler isn't that of the average Japanese dude who buys and reads this stuff. They don't fantasize about being a sumo wrestler and wish to have a body like one. I figured too that the decline of its popularity amongst a younger audience keeps writers from doing something focused on it.
This is why I was amazed to know of women who find the wrestlers sexy, according to most anime/manga, they don't exist. There's barely any series where they're treated as sexy/beautiful and hardly anything where women are into them. For most stuff with sumo, it uses them either as minor bad guys or comic relief, and in some stuff where characters gain weight to be a sumo, they are treated as ugly and not attractive. Even the designs for most sumo wrestlers in anime/manga makes them look ugly/cartoonish. Figured since most artists don't know how to draw fat people attractively, they wouldn't wish to present even fat/fit bodies as sexy/attractive. It's easy to think all men want thin curvy women but even they can have idealized male forms, it's often to be muscular not fat as various sumo wrestlers are. So no way they want to present such a body as desirable.
I guess I wonder if the concept of a female sumo series could ever occur. Maybe with Plus-Sized Elf coming out soon, it could inspire some creator to follow this premise and see where it goes.