MixiM/guide

Ragamuffin
Enter the pink mirror. Go right a bit and up from the mirror. Interact with the gray cat.

Jellyfish
Enter the blue mirror. Go south-west and enter the glass dome. Go right until you reach a room with a blue jellyfish holding an orb. Interact with the jellyfish.

Puzzle
Enter the purple mirror. Interact with the green, purple, and red crystals to be teleported to a small world. In each world, find a small black creature. Interact with it to gain Part of effect. Once all 3 Effect parts are collected, interact with the blue crystal.

Kitsune
(Jellyfish Effect is needed)

Enter the red plaid mirror. Use the Jellyfish Effect on the NPC in front of the door. Leave the house and go north. Go up the stone stairs and interact with Chie's Mom (the woman dressed as a shrine maiden).

Sugar Bunny
Enter the yellow mirror. Go north-west and interact with the pink mirror. Find and interact with the pink bunny.

Microphone
Enter the green mirror. Go right and go between the two music notes. Go south-west and interact with the sparkling silver circle.

Medicine
Enter the green mirror. Go right and go between the two music notes. Go between the two snow covered trees. Interact with the stone statue. Go down and right and interact with the flower.

Sick
(Puzzle Effect is needed)

Enter the white mirror. Enter the other white mirror. Go to the arrow on the wall and go left. Use the Puzzle Effect and interact with the door with the green lock. Interact with sick Chie.

Dark Flowers
Enter the white mirror. Go between the two tufts of black grass. Interact with the red flowers.

Chelonioidea
(Jellyfish Effect is needed)

Enter the red plaid mirror. Use the Jellyfish Effect on the NPC blocking the door. Leave the house. Enter the house behind you (use the Jellyfish Effect on the NPC blocking the door). Go into the stone safe. Go south-west and go through the red and blue archway. Go north-west and enter the square hole. Go down and interact with the large turtle.

Anime
(Jellyfish Effect is needed)

Enter the red plaid mirror. Use the Jellyfish Effect on the NPC blocking the door. Leave the house. Enter the house to your left. Go into the bed (you'll need to pick up the coke cans to do this). Navigate your way through the musical notes. Interact with the NPC. Go south-west and interact with the purple machine.

Bat
Enter the pink mirror. Go north-west to another pink mirror with sleeping cats on either side. Go south-west to where there are three mirrors and interact the one on the right. In the next area, interact with the purple bat to the north-west. Go south-west and interact with the purple-haired NPC.

Tokuto-chan
Follow the guide for the Bat Effect. Interact with the purple bird statue near the NPC. Make your way east and interact with the purple-hooded NPC there. In the next room, go south and interact with the gray NPC with the bloody head.

Short Hair
Enter the blue mirror. Go north-east and enter the dark blue mirror. Head south-west and interact with the sparkles.

Nightmare
(Medicine Effect is needed)

Enter the pink mirror. Go north-west to another pink mirror with sleeping cats on either side. Go south-west to where there are three mirrors and interact the one on the right. In the next area, go north-west until you see two mirrors. Equip the Medicine Effect and enter the mirror on the left. (This is vital because you'll only have a few seconds to make your way to the effect before being sent back.) In the next area, immediately hold the Shift key to dash to the sparkles. Interact with them to get the effect.

Halloween
(Bat Effect, Jellyfish Effect, and Key Item are needed)

Enter the red plaid mirror. Use the Jellyfish Effect on the NPC blocking the door. Leave the house. Enter the house behind you (use the Jellyfish Effect on the NPC blocking the door). Go into the stone safe. Go north-west and enter the light beneath one of the UFOs. Make your way to a pink-haired NPC and use the Bat Effect to interact with her. Go north-west in the next area to a house. Head inside the house and follow the guide to obtain the Key. Once that's in your possession, go up the stairs on the right and enter the closet. Follow the path until you reach the end room. Activate the pentagrams in the room's four corners by passing over them in the following order: upper-right, upper-left, lower-left, lower-right. Interact with the ghost NPC that appears. You'll then be teleported back to the house. Interact with the purple doll NPC in the room up on the right.

Night
(Jewel Item is needed)

Follow the guide to obtain the Jewel. Enter the mirror in the upper right corner. Insert the Jewel into the opening in the wall. Interact with it. Navigate through the room and interact with a second jewel. Once you're in the next area, go south until you reach a space with three blob-like figures at the top. Interact (press the Z or Enter key) while stepping on the sparkles on the floor.

Angel
(Angelical Charm Item is needed)

Follow the guide to obtain the Angelical Charm. Exit the house and go north-east. Pass between two angels. Go north-east from where you're teleported until you reach a trio of angels on a bed of flowers. Interact with the white figure floating between them.

Strawberries
Enter the yellow mirror. Go south-east and interact with the small tree.

Coke
Enter the red plaid mirror. Use the Jellyfish on the NPC blocking the door. Leave the house. Several coke cans can be found in the houses above and next to you.

Flower
1. Follow the guide for the Jellyfish Effect. Interact with the jellyfish you got the effect from. Go across the bridge until you're teleported to another area. Go north-west and enter the building. Go up to the top floor. Interact with the bust with the crown.

2. Enter the green mirror. Go right and between the two music notes. Go south-west and between the two trees. Go up and right from where you're teleported and interact with the spindly gray statue. Go south-west and enter the cave. Go up through the door. Go north again and go through the light on either of the floors higher up. Interact with the red flower.

3. Follow the guide for the Sugar Bunny Effect. When you enter the area you get that effect from, go right and interact with the red blob. Go north-east and interact with the line of NPCs.

4. Follow the guide for the Dark Flowers Effect. Go south-east and enter the cave. In the next area, go south-east and pass between the crosses. Head north while avoiding the chasers (use the Shift Key to dash) and interact with the red flower near the large evil-looking figure.

5. Enter the green mirror. Go south-east and pass between two angels. Go west and go between the golden curls. Interact with Chie's family.

6. Enter the green mirror. Go right and go between the two music notes. Go between the two snow covered trees. Go west and equip the Kitsune Effect in order to interact with the bear girl NPC. In the next area, go south and interact with the purple NPC with the long hair.

7. Follow the guide for Flower 6. Go a little further south and interact with the pink-haired NPC with the mask.

Colorful Pills
(Sick Effect is needed)

Enter the yellow mirror. Go south-west and interact with the purplish stack of pancakes. Equip the Sick Effect and interact with one of the ghouls. Go through the door and interact with the NPC in the white lab coat.

Jewel
Follow the guide for the Short Hair Effect. Go further south-west and enter the cave. You can find this item in one of the treasure chests. (You can also obtain the "???" item this way.) Be careful: chasers will awaken whenever you open a chest.

Angelical Charm
Enter the green mirror. Go south-east to a small grass-roofed building. Head inside and interact with the sparkles next to the bed.

Key
Follow the guide for the Halloween Effect. Inside the house, head up the stairs on the left and use the Jellyfish Effect to destroy the pumpkins on the table. The key is inside one of them.