The Whistle effect allows Sabitsuki to manipulate the movement of NPCs. To elaborate, when the whistle is blown all moveable NPCs move in the direction Sabitsuki is facing.
- Nexus -> Neon World -> Hospital -> Red Monster Pathway -> Flesh Walls: Can be found in the room guarded by a Black-haired Girl. The effect is gained by touching the whistle at the end of the room.
Go left and you'll see a girl standing at a door. Go through it. There should be a whistle on the floor in this room you can pick up.
- The Whistle effect is similar to the Cat effect in Yume Nikki as it allows Sabitsuki to manipulate the movement of NPCs. However unlike the Cat effect in Yume Nikki it does not necessarily attract NPCs.
- The effect is ホイツスル in Japanese.