8/41 is an alternative ending for stage 3. You need to defeat the boss (Jyuzou's *****) with a throw to unlock it. Just walk up to her and press circle like you would against any other enemies.
The last line of ''???'' is probably the Red Blade. Not 100% sure about this but IIRC it'll be available once you beat the game with any route on any difficulty. --- In memory of one of my favorite manga artists, Usui Yoshihito. May your soul rest in peace. Sep 20, 2009.