Think you mean
3rd. The only 'guide' on the 2nd is mine, that I didn't bother to finish because there was another (imo, better/less wordy) while I was going about playing/writing.
Ps. Personally, think there's a way to save the slave from being eaten by the black slime, but no clue. -- If you decrypt the game, there's an image of her blushing and her eyes aren't vacant.
Ps2. The 3rd page walkthrough/guide could use some work too; like their suggestion for the boss battle. There are some equips that auto-casts, at start of battle, some of the skills, like the battle formation they suggest for turn start. Pair it with the equip that allows you to change equipment during the fighting (No turn loss). Another good equip is one that gives you charges each turn, and allows you to charge, to increase how much damage you do. Real helpful that.