Prequel
67
71
72
Spin-off
When martial artist Ikeuchi Mentaro is defeated in a tournament hosted by the Rokushin Kaikan karate school, he gives up karate to seek the strength he could not achieve through it. Soon enough, Rokushin Kaikan calls for another open tournament, and invites Ikeuchi and several other martial artists from different schools to compete. Ikeuchi sees this as the chance to get his revenge, and see how far he's come. (Source: Kenganverse Fandom Wiki)
Other
Hibiki is a teenage girl who loves to eat, but when she notices her waistline expanding, she decides to check out the local gym. The gym is full of buff dudes…and Akemi, the student council president?! When Akemi tries to convince Hibiki to take up weight training, Hibiki resists–until she meets pretty boy trainer Machio. Now, Hibiki is willing to do whatever it takes to get fit! (Source: Seven Seas Entertainment) *Note: This manga is set in the same universe as Kengan Ashura and ST✰R: Strike it Rich.*
Other
After retiring from public fighting and getting fired from underground fighting, 27 year old Tenma Nozomi's zest for life is gradually dwindling away. It's hard to be at the bottom with nowhere to go, and that's exactly where she and her two friends are. However, Nozomi hits upon an idea that may just solve all of their problems: they could make their own underground fighting circuit for women, and tap into an underexplored market. As good as that sounds, her insistence on including the unknown quantity Hongou Hina may prove to be more than she bargained for... (Source: Comikey Media)