TATAKAE! RYOUZANPAKU SHIJOU SAIKYOU NO DESHI is pretty much a a prequel of History's Stronger Disciple Kenichi. There are some characters that are the same for the most part(missing Shigure and Apachi from Ryouzanpaku)Some like different (Takeda, Kisara, Hermit, and Ma Kensei). The story is still the same premise(weakling desires to train in martial arts for self-defense). I would recommend this manga if you like HSD:kenichi. Its like an alternate universe.