completed the game with Kaede on 1/8 difficulty and got the score: 534400.
On this difficulty, the normal fights are ridiculously easy. However, Musashi and Shinnosuke Kagami were still challenging. Still this game is nowhere near as hard as Ninja Master's etc.
completed the game with Moriya Minakata on 3/8 difficulty and got the score: 104703.
He's cool. I just started playing in AES mode, so the 4 credit limit was a bit intimidating. But I finished on the last credit.