Made In Nightmare (メイド・イン・ナイトメア)/guide

Cow / うし
Enter the purple door. Go down and right and interact with the cow.

Tri-color Cat / みけねこ
(Cow/Weasel/Dolphin effect is needed).

Enter the purple door. Go north-east and interact with the purple head with antlers. Go left and enter the door. Exit the room. Go south and find/enter another crack in the wall. Go north-west and interact with the orange cat head.

Butterfly / ちょう
Enter the green door. Go south-east and enter the building covered in vines. Go down the ladder. Go right and down the ladder. Go left and down another ladder. Go right and you'll be teleported to a hallway. Go down the hallway and interact with the silver butterfly.

Weasel / いたち
Enter the zipper door. Go north into the column maze. Find and interact with the silver head with teeth.

Shark / さめ
Enter the slanted tile door. Go south-west and interact with the shark fin.

Starfish / ひとで
Enter the slanted tile door. Go south-east and enter the door with the person on it. Go north-west and enter another door. Go down and interact with the green plant.

Caterpillar / しゃくとりむり
Enter the green door. Go north and interact with the caterpillar NPC.

Dolphin / いるか
(Shark effect is needed).

Use the Shark effect to kill NPC's until you get 500 money. Enter the door with stained glass on it. Go right and up and interact with the girl in pigtails. Purchase the effect from her.

Puppet / にんぎょう
Enter the door with stained glass on it. Go left and up and enter the dark gray building. Enter the door behind the NPC. Navigate your way through the maze to the NPC pictured to the right.

From here, you need certain effects to enter the doors ahead of you. The effects are: Cow, Caterpillar, Weasel, Starfish, Butterfly, Tri-color Cat, Dolphin. Go up and interact with the replica of Nemu.

Girl in Gray Building and puppet event.
Enter the door with stained glass on it. Go left and up and enter the dark gray building. use Puppet effect and NPC changed a little.