If you're looking for manga similar to Hanakaku - The Last Girl Standing, you might like these titles.
Wild's High has a 42-year history as a fighting specialized, girls only, private high school meant solely for the elite. It is also the place that Wild's-League is held: the most popular event in the country and the only place in the world where teenage girls have brutal fights with their lives on the line. One year the school changed from a girls only school to a mixed gender school. The only male student, Song Jae Gu, has been granted a full 3-year scholarship regardless of grades. Being someone who had to spend every moment either working or taking care of his younger brother and sister, he accepted. But after meeting Queen, the bloody champion of Wild's-League, drenching her in coffee, calling her a monster, and getting caught seeing her while she was taking a shower... his scholarship could prove fatal.
Both of these stories focus on main characters that want to get stronger to be able to deal with bullying, past and present. They also feature main characters that start from the bottom, but work their way up to both being good fighters and meeting their other goals. Both of these series have strong women, a d they both also feature a similar sense of humor.
Taichi is a fat teenager and a horrible embarrassment to his little sister, Mika. She saves her own image by refusing to acknowledge him in public, but that won't work forever. In order to solve the problem, she enrolls him at a boxing gym, hoping the exercise will make him lose weight. At first, Taichi is very hesitant about the whole idea. Soon, though, his trainer Kurata's tough encouragement makes him feel like he might actually be able to become good at this sort of thing. But while the boxers at the gym accept him as a fattie coming in to jump rope and hit punching bags, will he be able to get them to accept him as a boxer-in-training? And does he have what it takes to become an actual boxer?
Goshima is a boxer who has held the world championship title for years and never once lost a match - thus earning himself the nickname 'Zero'. His coach, Araki, describes him as 'a flower that blooms only within the ring'. But with his 30th birthday approaching, everyone begins to question Goshima's worth. Thus he decides to look for the ultimate opponent to give him his final match.
Rikitaro is a musician whose dream is to become a rock star just like Jimi Hendrix or Jim Morrison, but at the age of 27 that dream is fading away rapidly. Ooishi is a 3 time world boxing champion who recently retired and is now in the entertainment world, shooting a boxing reality show. These two unlikeliest of people cross paths one day, but both of them think nothing of it until weeks later. Rikitaro is given one last shot by a record label to sign a deal but before that, they need him to get into better shape so that he is easier to sell. He stumbles upon a boxing gym which also happens to be the same gym Ooishi is filming his show. As fate’s wheels start to turn, neither man realizes that they will work together to train the best boxer ever, even better than Ooishi himself.