Whoa! So, this is based on Renegade instead of being an original game?
It's an original game that serves as a sequel to the 3DS remake of Renegade. Yeah, it's kinda confusing.
Mechanically speaking, all the 3DS games are all very similar. Aside from this game, they include:
-the Renegade remake (Nekketsu Kouha Kunio-Kun SP)
-an eShop-only spinoff game starring Riki (Riki Densetsu)
-another eShop-only game with a fantasy RPG motif (Nekketsu Mahou Monogatari)
-a followup to an old "RCR but as a period drama" game (Downtown Nekketsu Jidaigeki)
and there are two other releases that still aren't out:
-a River City Ransom remake (Downtown Nekketsu Monogatari SP, out late October)
-a compilation containing all 11 Famicom games (Kunio-Kun Nekketsu Famicom Complete Collection, no release date but could be out by the end of the year)