Satoyama and his best friend Kawakami both like the same girl - Mizutani, a tomboy whose father owns a boxing gym. They both join the gym to get closer to her, but unfortunately she has a bad relationship with her father and for some reason won't talk about boxing. When she sees Satoyama's punch, however, her heart begins to change; she had given up on boxing, even though she was a boxing prodigy, because a woman could never compete with a fully-grown man. But perhaps she could train Satoyama to take on the world in her place! Satoyama doesn't really care about the championship, but if it means Mizutani will spend more time with him he'll do anything!
When Koh was eleven years old, he lived a quiet and peaceful life, delivering sporting goods for his family's store and batting frequently at the Tsukishima Batting Center. Though Koh had no interest in baseball, he started the play the sport anyways after a series of events, much to the delight of his best friend, the beautiful Wakaba Tsukishima. However, soon life dealt Koh a tragic turn, changing him forever. Now, years later, Koh attends Seishuu Academy and is soon pulled back into the world of baseball. Alongside Wakaba's talented sister, Aoba; old friend and fighter Nakanishi; and plenty of new teammates and companions, Koh will once more pick up the pitcher's mitt and see if he has what it takes to be a champion.
Replace the baseball in Cross Game with boxing, and you have Katsu! They're both done by Mitsuru Adachi and are extremely similar. They have the same humor and some character designs are shared. If you're a fan of one, I'd strongly recommend the other.
Ippo Makunouchi is an average and overly-shy high school teenager. His mother runs a fish boat shop and he constantly has to help her with it, and thus has no friends. Constantly bullied because of this, Ippo wonders what it would be like to be strong. A chance encounter with Takamura Mamoru, an up and coming boxer in the Japanese ranks, leads to Ippo's revelation that he has an incredible punch. Takamura sees potential in Ippo, and brings him into Kamogawa Gym. Thus begins Ippo's journey to discover just what it's like to be a winner. With a fighting spirit, can Ippo eventually become a professional boxer?
Not only are both Hajime no ippo and Katsu! about boxing, but they are also more about the tenacity and fighting spirit motivating the boxers. Both started in the 80's and it shows, but don't think that dates them, since they both show the inner lives of boxers.
Identical twins Tatsuya and Kazuya may look the same, but it's the younger Kacchan that everyone is interested in. As an excellent baseball player who is popular with all the girls and friends with all the guys, it's no wonder their childhood friend Minami prefers him over the slobby and less social Tacchan. In life, however, the path to true love and success is never an easy one -- a lesson the two boys will learn through a mix of sporting events, love triangles, typical school worries and a number of other painful and challenging situations...
Both of these manga are by the same author, Adachi. All of his work have a similar style to them. They feature gifted athletes, drama elements with some comedy thrown in and budding romance. If you like one Adachi work, it's probable you'd enjoy another.