I've looked through almost every character path, and I'm getting frustrated as hell unlocked that last stage I need. Just how can I unlock Hetsugigawa Heroes stage? I'm running out of ideas here --- Char Aznable says, let the purge begin!
I unlocked it by playing as Fuuma, and ignoring Kanbei and Yoshihiro as much as possible in his Blue route. I think you can get it as Mitsunari by beating those two in Blue, and Hondam gets it in his Red route (go to Satake's stage after beating Mogami).