PDP Guide Part 7: Mist Lake and Scarlet Devil Mansion

Part 6 can be found here.

Once back in the Human Village, head through the left exit (the way to the Forest of Magic). Head straight through the path until you get to the turn. While you would normally head left to reach the Forest of Magic, instead head up and then left. Cut down the nearby trees to continue.

Head along the linear path until you reach a split in the path. There is nothing to the right, so head left instead. There are two trainers here who will fight you if you talk to them. The one on the right uses a level 22 Tokiko, while the one on the left uses a level 22 Wakasagihime.

Head straight up past them, there is some grass here. Most of what you catch is not new, but there is a chance of catching Orange here, if you so wish. She's kind of rare though.

Heading straight up, you will reach Misty Lake. First of all, in the grass here you can catch Meiling, Wakasagihime, Daiyousei, Cirno, Rinnosuke, Tokiko, and Nue.

Basically, our goal here is to get directly across the lake. This can be completed by going either left or right. It is your choice. You could also go both ways before entering SDM. It's up to you, really.

Trainers to the Left:
Brown-haired Fairy: Level 23 Wriggle
Animal-Ears Girl: Level 21 Chen, Level 21 Kagerou
Yin Yang Orb containing Sapphire Hairpin
Path Down. Not necessary to take. See below for details.
Wakasagihime (wait for her to swim near the shore, or head down the downwards path and then back up to catch her in time): Level 20 Kagerou, level 20 Sekibanki, level 22 Wakasagihime.
Path Left. Cannot take yet.
Trainer with Cape: Level 21 Luize, Level 21 Luize

Trainers to the Right:
Yin Yang Orb containing Contract Thread
Boy Trainer: Level 23 Kurumi
Black-haired Girl with red ribbon: Level 20 Sekibanki, level 20 Daiyousei, level 20 Cirno
Ghost: Level 23 Merlin
Girl with Hat: Level 23 Nitori
Yin Yang Orb containing Light Charm
Fisherman: Level 21 Shizuha, level 21 Minoriko
Purple-haired Fairy: Level 21 Cirno, level 21 Cirno
Old Man: Level 21 Wakasagihime, level 21 Wakasagihime

Path Down from the Left Route:
Animal-Ears Girl: Level 20 Chen, Level 20 Kagerou
Grass that may contain Rinnosuke (rather rare).
Brown-haired Fairy: Level 20 Orange, Level 20 Orange
Purple-haired Fairy: Level 22 Cirno
Yin Yang Orb Containing Skill Card 23
Black-haired Trainer: Level 20 Rumia, Level 20 Mystia
Hop Down to Return Quickly to Human Village (it'll put you right by Sekibanki)
Yin Yang Orb Containing Courage Charm
From here, it is probably faster to hop down the ledge and return to the Human Village to heal before continuing on.

Regardless of how you get here, once you see a path that goes up, you are in the right place (not to be mistaken for the path that goes up along the right that has grass. The correct upwards path is grassless).

You will see Meiling and then you'll see Marisa sneak in. Meiling is sleeping, so you don't need to worry about her yet. If you go to the left from here and around the fence you'll reach a Yin Yang Orb that contains Skill Card 45. Now, go back and head into the mansion.

Inside, you will see Remilia. I don't speak Japanese, but I'm assuming that she is taunting you, as she leaves after a conversation with you through a locked door and you have to get to her.

Head to the left and down the nearby stairs, then through the door to get into the Library. Head straight and then up the nearby stairs. Keep going straight through across and down the next set of stairs. Keep going and then down another set of stairs. Head through the archway and you will be challenged by Koakuma, who will use a level 22 Tokiko, level 22 Daiyousei, and a level 22 Koakuma.

Keep heading through archways (it's really linear) until you see Patchouli, who will challenge you. Patchouli will use a level 24 Alice and a level 26 Patchouli. You can now speak with Patchouli any time you like and she will heal you. If you head up and through the next archway you will find an Akyuu.

Head up the nearby stairs, down, and to the left and speak with Marisa. She will move out of the way giving you easy access out of this area without having to go through all the rooms of the Library and such. Now, to the right, is a door out.

Now, fair warning.
This is, I believe, the most complicated area in the game, in my opinion. For now, I will give instructions purely to reach the exit, and not to collect items. I will perhaps go back and do a completion guide for it later, but for now, it is simplest to give a simple guide of where to go to get out. Otherwise, it is possible to wander around through here for hours.

I would also like to give credit here. I would not have escaped this area without a Map I found that a user of 4Chan had drawn. Thank you so much to that person because you are a serious time-saver.

Please follow my instructions precisely to be able to escape this Basement area. It is very easy to get lost.

You can capture Koakuma, Patchouli, Sakuya, Remilia, and Flandre here. Flandre is extremely rare, Remilia is kind of rare.

From the Library, head up. As soon as you can, turn right. After continuing a bit, if you see Flandre run nearby, then you are in the right place. Keep going straight until you can go up.  Keep going up until you cannot go up anymore.
Along the way, you will face a Fairy Maid who uses a level 26 Daiyousei.

Once you can no longer move up, turn to the right (only option) and past the two shrubs which mark a map switch.

Ahead of you will be a Yin Yang Orb containing a Scimitar Charm.

Head down through the next two shrubs/map switch. Keep heading down, and then to the right until you get the opportunity to move up. Do so.

Now, you will see three paths. This part is kind of tricky, so bear with me here.

Take the center path first. This will take you to a similar area as you were before taking the door. Now, take the door on the right. Finally, take the door on the left.

Now, you will be in another area with three different paths. These ones aren't weird though. Take the center one first and fight the Fairy Maid who uses a level 27 Sakuya. Past here you can find a Yin Yang Orb containing an Oath Thread (higher quality than Contract Thread).
Now head back down past the Fairy Maid and take the left path instead and head through the door.

Pick up the nearby Yin Yang Orb containing Skill Card 27. Then keep heading straight and through the double doors. There's a bed in here that you can use to heal. Do so. It's important. Head through the right door to continue.

Congratulations, you have made it out of the maze that is the Scarlet Devil Basement. You may now head down the nearby stairs and keep going down until you reach an exit door. This allows you to come and go through here as much as you like. You may even return to the Library area to level, which I highly advise.

The door at the very top of the stairs is where you need to go, but I highly advise leveling a bit first. If your entire party is not level 30+, then please head back to the Library, go into the basement, and run around right outside the library door for a bit to level. Trust me. Please. Remilia marks a level spike, and it is important to have the team to combat it.

To give you an idea of what a prepared team might look like, here is my team as I go to fight Remilia:
Level 46 Speed Momiji
Level 39 Power Lily
Level 35 Defense Sukuna
Level 32 Power Shou
Level 30 Speed ReisenII
Level 25 Toyohime

When you are done leveling, head back through the Library to the main lobby and go through the previously locked door which you recently unlocked. Head all the way up the stairs and approach the center door to be challenged by Sakuya. Remember that the door to the left of this center door has a healing bed, as well.

Sakuya will use a level 27 Meiling, level 26 Ruukoto, and a level 30 Sakuya.

Go back and heal, and then head through the door when you are ready.

Remilia will face you in here. She will use a level 35 Sakuya, level 34 Flandre, and a level 40 Remilia.

Yes, level 40. Have fun.

Once you have defeated her, she will allow you to change the names of your Puppets.

Head through the door behind her to pick up a Yin Yang Orb containing Fate Thread. This is the equivalent of a Master Ball, so please don't use it lightly. Save it for something amazing.

When you are ready, head out of the Scarlet Devil Mansion (heal at either the bed or Patchouli first).

Down past Meiling, you will be approached by Aya Shameimaru. This signifies that you may continue, so, on to the next part of the guide!

Link to Part 8 here!