Added Ring Ni Kakero 2 to my list (pages took from @Kevmuella90 account who i hope won't mind)

From the Final Chapter of the Manga "Ultra Red"

おっぱい = Tette

I forgot to add, Ayane High Kick does have a manga but it's very hard to find as very few copies have been produced, it's also a bit different both in style and tone from the anime, some pages

Gosukon by author Fuyu Naga is a manga about a girl called Hamada Ari who wears Gothic Lolita clothes, which somehow finds herself involved in various boxing matches, she's meek and weak until she sees her own blood at which point she transform into a bloody thirsty demon

With such a premise, you can usually imagine how these fight usually goes, she gets beaten, she gets cut, then her opponent gets murdered, it's quite feticistic and the author seemed to love boxing in this sort of context

this manga was serialized in a magazine but it only ran for 9 chapters the author also loved to draw horror and in the last chapter, ari punches the air so hard she slices her opponent face in half, blinding her as blood gush from her eyes which is both very silly and a bit gross

I like this last page with ari declared as the winner so here it is, the author drew a lot of doujin some of which happens to be related to boxing

first we have Kuchibiru Kara Subete ga Hajimaru, this is just a doujin about sex with various profession, but one of the profession covered is "female boxer" the girl in this doujin is super cute, 10/10 would let her beat me up

then we have Kono Sekai niwa Yuuki Ningyou ga Iru, this doujin is about "dolls" in one scene we can see two dolls do boxing, the dolls are powered by the sexual lust of their owner so if the owner cum, the doll lose all their stamina, it's quite silly and a bit embarassing

lastly we have what has to be the weirdest scenario i've ever seen in Burgess Girls, woman without arms box with their boobs so rather than have a glove tap they have a nipple tap, i feel like removing the gloves is a huge sin, but i'm still watching girl getting smacked i guess?

somehow, several of works related to Go Nagai, contains depiction of sexy female boxing, perhaps he realized the fetish potential of it even way back then first we have Abashiri Ikka, a manga about a family of criminals which features this random topless boxing scene out of blue