Regarding the error, sorry to say but I don't have a clue.
Regarding the enemies inside the memories room, you're not really suppose to win or fight them. You are suppose to use the request skill for them to use those skill to defeat you to see the game over rape.
There are two type of fights, normal fight that always have more then 1 enemies, and boss fight, always 1 enemy.
For normal fight, these is nothing too special. They usually have the same rape dialogue and all those are only like 3-4 lines. Don't be fool by the 4 types of normal enemies, they are separated into 4 group(you can tell via their expression) with 4 different dialogue only. The only different might be using the request skill that deal damages to your hp directly, didn't try this one too much myself
For bosses, same thing, except their dialogue is much longer. Some of the game over rape is the same between skills, like handjob and blowjob or handjob and nipple play, you just have to see for yourself.
Each boss only have 1 cg for their special move, except the two succubus.
Hope this help, really hard for me to explain this game well
If anyone is still playing this game, avoid the slime and the fox first, those are too hard to fight (for me), even with end game gear.