Amnesia/guide

Two Knots
Go to Forest World and find a little girl who has two knots and sitting on a bench that gives you the Two Knots effect.

School Uniform
Go to Forest World and find a locker that leads you to the School, interact with the school girl that gives you the School Uniform effect.

Magical Girl
Go to Colorball World and find a dress on the floor that gives you the Magical Girl effect.

Flashlight
Go to White Star World and go to the center of a cross that leads you to Black Star World, find a blue star NPC that leads you to the Neon Stairways and go up the stairway when you reached the place that has 2 stairways, interact with the NPC that leads you to Colorful Path, go to the down left corner and interact with the Flashlight.

Cutter
Go to Colorball World and go into a blue ball entrance to the Blue Maze, go to the right part to find a hole to the Bottle World, go into a broken bottle and interact with the girl inside, go out of the bottle you will arrive to the Blood Path, go to the down left corner and interact with the Cutter.

Haunt
Go to Colorball World and go into a blue ball entrance to the Blue Maze, go to the right part to find a hole to the Bottle World, go into a broken bottle and interact with the girl inside, go out of the bottle you will arrive to the Blood Path, go to the down right corner and interact with a soul to the grave, interact with the ghost that gives you the Haunt effect.

Angel
Go to White Star World and go to the center of a cross that leads you to Black Star World, go straight up until you reach a halo with wings that gives you the Angel effect.

Hakama
Go to White Star World and go to the center of a cross that leads you to Black Star World, find a blue star NPC that leads you to the Neon Stairways and go down the stairway when you reached the place that has 2 stairways, down to the Neon Street and go right to the apartment, go to the first room of second floor and interact with the dress that gives you Hakama effect.

Apple
Go to White Star World and go to the center of a cross that leads you to Black Star World, find a platform with 3 stars that leads you to the Hallway, go into an entrance that leads you to the FC Forest and go straight up until you reach an apple tree that gives you the Apple effect.

Teru Teru bozu
Go to Forest World and find a locker that leads you to the School, go to another classroom that has a vise of flower which takes you to the Apartment Room, go out of the room and interact with the NPC that leads you to the Gray Maze B, go down and interact with the Teru Teru Bozu.

Drums
Go to Forest World and find a flower gate that leas you to the Rose World, find the Drums in that place.

Sea Slug/Clione
Go to Colorball World and find a clover that leads you to the Ocean, go to the end and interact with the Sea Slug.

Cube
Go to Block World and enter a black building with an entrance, go to the end and interact with the Cube.

Sepia
Go to Sepia World and find a mouse NPC that gives you the Sepia effect.

Endings
To acchieve the first ending you need to find all effects, after that there will be a door appeared on the nexus' center to let you drop all the effects into the drower. To acchieve the second ending you need to find the Teddy Bear in Teddy Bear World.