Re: 薬と魔法のミーリエル
If you jump back to the post on page 6 by noman, it details what you need to do for all of the pre-1.3 scenes (i.e. everything except the 3 new scenes indicated by stars).
As for the star scenes, bgn just detailed how to obtain those.
Regarding the bath house boss, I also had a lot of trouble handling it, but I finally managed to find a solution that worked (albeit not perfectly) for me at level 51 (Alice is level 43).
1) Purchase an arbalest (12000T from the weapon merchant in the north part of town) for both Miriel and Alice and equip them.
2) Do whatever in the first turn (I casted attack spells on the right mob).
3) Your TP should be high enough to be able to use March Sniper (bow icon, 40 TP), if you insta-kill the mob on the right you're in good shape, if you don't reload and try again (This step is important since the mob on the right heals everyone for a huge amount).
4) Once the mob on the right is dead, put everything into killing the boss in the middle (I used the 4th Fire Bolt spell (18 MP) and the 4th Ice Bolt spell (27 MP) on the boss every turn).
Chances are Alice will die pretty early into the battle, but if you can keep Miriel alive long enough to kill the boss, everything will be fine. His spells dealt about 600 damage which were higher than Miriel's HP for me, but I managed to get one fight where all of the boss's spells missed when they were targetting Miriel.
The mob on the left presumably puts up buffs, but that's really all it does. I tried to take it out before the boss a few times, but I feel it's really just a waste of time since the boss and the mob on the right are the bigger threats.
I even tried draining all of the enemies' MP one time, but the boss kept regenerating his MP and spamming a skill that replenished the MP of the lesser mobs.