When Garry becomes insane after failing the Doll Room, Ib will need to go inside the room. The room appears to be filled with bunnies through Ib's perspective. Garry can be seen talking to a bunny. After Garry makes a few statements, Ib then has to choose how to respond to him, although the answer itself does not determine the ending.
To obtain this ending, Ib's bond with Mary must be less than four points. After the player makes a choice, Garry will continue to hallucinate. Ib, depressed, will sit down next to Garry. Mary tells her to get up, but Ib tells her to go ahead. Mary will then leave the room and decide not come back for Ib.
From this point on, Mary becomes the controllable character. Mary must travel back to where she came from and head to the place with the headless statue. Mary will then ask the statue to move. The statue will obey her and let her through. Mary will then travel down the stairs back to the reception. Messages will be displayed around the gallery, telling Mary to go back and stay with them. She will ignore this and continue her path.
Mary then finds the Fabricated World painting and thinks she would get out that way. However, it's said that she needed to take the place of someone else, but she did not do so. When Mary jumps into the painting, she'll see that no one is in the gallery. When she finds the entrance to the art gallery, she would find that it's locked. Mary now finds herself trapped inside the real art gallery. After a while, the screen will get dimmer, the windows will start to leak red paint, messages will appear on the walls, and some paintings will change in disturbing ways; at this point the messages on the wall are not imploring anymore, instead saying that Mary is a "bad girl," that her heart is fabricated, and that for her there will be no going back; the last of these messages will ultimately say, "BYE BYE MARY." Mary asks if someone is there writing them and takes out her palette knife for protection as the screen gets dimmer and dimmer. When Mary wanders around the gallery, she will say that she's scared and asks for help. When she reaches the reception desk again, a picture of Mary, dead, will appear where the sign is, above the reception desk. Mary will wonder if that is her, but she leaves it for now, as she needs to get out of the art gallery. While she walks terrified through the empty gallery, Abyss of the Deep will start to leak and ooze across the gallery's rooms and floors, Embodiment of Spirit wilts and A Well-Meaning Hell will change into Tones of the Dark Gallery.
As dark paint fills the gallery, the screen will continue to dim until it's pitch black and will stay that way to the end. Mary cannot see anything and starts to ask why she is the only person in here. Mary will start to cry and ask for Ib to help her since she's lonely. When that fails, out of desperation, she'll instead shout for Garry's help. Mary will soon hear footsteps and keep asking for help, then say nothing for a while. After that, Mary will shout, ".....father.....!"The screen will then display the name of the ending.
- Doll Room entrance - "Forget about Ib!"
- ??? (Theories) on This World - "......" (some words are blurred)
- Conquer the Unknown and Know No Fear - "I don't get it..."
- The ??? (Essentials) of Color - "Wow... This book's all colorful and pretty!"
- Terror - "I wonder who tore it?"
- Collected Works of Guertena (2)
- Strained Ear - "Hey, Strained Ear! Listen up! I'm gonna be going outside now! Tell the others to come along if they want! It'll be fun!"
- Lady With Her Umbrella - "Good thing you've got one!"
- A Girl's Demise - "The letters are all blurred... I can't read this." (the text will be mostly question marks)
- Collected Works of Guertena (1) - "Should I take a look?"
- Aspiration - "I wanna moon bed..."
- Headless statue - "...Can you move for a sec? I need to go down." (the statue moves) "Yaaay!"
- After it moves - "Bye-bye!"
- Fabricated World - "I'm here... This is the one!"
- In real world - "The painting's different..."
- Beach Isolation - "Oh, this is the beach...? I wanna go there..."
- The Lady in Red - "Big sis!"
- As gallery darkens - "Big sis..." (with a sad face)
- Reception desk poster - "Guertena Exhibition..."
- After it changes to collapsed Mary - "Is this me...?"
- Pamphlet - "?" (with sad face)
- If the player checks the inventory while the gallery dims, Mary's inventory will be covered in blue crayon, and Mary will look terrified. Mary might also be replaced with a poorly drawn, menacing scribble of a girl, probably to represent Mary.
- This ending is presumably the worst ending, since Mary, Ib, and Garry all meet a terrible fate.
- The staircase that would normally lead down to the Sketchbook goes directly to the Guertena Art Gallery when the player is in control of Mary. However, it is possible that Mary passed through the Sketchbook offscreen.
- This is the only ending that can be Played with Mary.