Make sure you backup your saves which are located here:
C:\Users\[windows username]\Documents\KoeiTecmo\SAMURAI WARRIORS 4-II
This game doesn't have Steam Cloud, so if you change PC, you lose your progress. That, and the in-game save menu makes it very easy to accidentally delete your save. It happened to me, so I ended up downloading a 100% save online to just keep playing the stories I hadn't played yet.
As for the game itself, all I can say is it's not my kind of game. Most characters feel like their personality is overdone and don't feel natural in how they behave.
Combat wise, it's hard to know the controls, because there's nothing in the game to tell you which button does what. They show icons which correspond to a type of attack and such, but it's up to you to guess which button does what to begin with. In the end, I just figured that B is for Musou, A is for jump, X is for normal attack, and Y is for crowd control.
On the plus side... I tried playing the original Samurai Warriors on Playstation 2, and even on Easy difficulty, I kept getting a Game Over because the enemy killed my boss before I could even come to save his sorry butt. At least, in this one, when I set it on Easy, it truly is Easy. I can just brute force through everything and focus on what little story telling there is and move on.
