Ending
In order to get the ending you must collect all effects then after that you will have to catch the Blue bird that takes you to the wings effect then you will see that Little Kamitsuki Killed his Parents After that Interact with Him Then Kamitsuki will kill him then wake up then you will need to come back to the Hospital room where his mother is. then you will see Little Kamitsuki again then interact with him then Kamitsuki cries then Wakes up again then you will need to come back to the nexus then back to the Hospital door there you will see some person that will look a Bit like Sabitsuki after You kill it Then Kamitsuki Cries again. With the Band aid Effect and then some of the Effect NPC's will appear then the Yellow Page NPC will go near him after that Kamitsuki Comes with them then in the real world Kamitsuki Kills Himself. And then Credits will appear then on the Bottom Right of the Credits Kamitsuki and the effect NPC's Are Together. and thats how you get the ending.
Effects Guide
This is a list of the effects (aka Items) and where to find them.
Sword
Found in Kamitsuki's dream room.
Box
Nexus → Black Door → School
Game Console
Nexus → Rainbow-colored Door → Game Consoles World
Curry
Nexus → Brown Door
X Band-Aid
Nexus → Tears Door
Wings
Nexus → Cages World → Blue Bird World
Black Page
Nexus → Black Door → School → Hell
White Page
Nexus → Tears Door → "Unneeded" World → Experimental Facility
Yellow Page
Nexus → Brown Door → Gears World → Laboratory → Yellow Room
Blue Rubber Band
Nexus → Eyeball Door → Eyes World
Sign
Nexus → Eyeball Door → Raw Land
Brown Page
Nexus → Rainbow-colored Door → Building Block World
Bear
Nexus → Cages World → Forest
Magician
Nexus → Eyeball Door → Eyes World → Pink World
Dracula
Nexus → Black Door → School → Hell → Victimization → Demon King Room → Castle
Poseidon
Nexus → Black Door → School → Sea World
Chocolate
Nexus → Brown Door → Gears World → Sweets World
Hockey Mask
Nexus → Cages World → Desert
Makeup
Nexus → Eyeball Door
Machine
Nexus → Brown Door → Gears World
Sensitive to Cold
Nexus → Tears Door → "Unneeded" World → Experimental Facility → Snow World → Igloo
Demon King
Nexus → Black Door → School → Hell → Victimization → Demon King Room