D

D is a side character who only appears in Version 2 during The Prologue. She is shown to be living with E.

Appearance
D's eyes are black, but they aren't pitch black like .'s. She wears black fingerless gloves, a grey shirt, and a white skirt with black shoes. She also has white stockings on her legs that seem to be uneven. She has long black hair with an ahoge at the top.

Personality
D is caring towards E, trying to reassure her that things will be fine, despite the ongoing massacre. D is apparently about to cry after E shouts at her, and leaves the argument while repeating that she doesn't hate E. D seems to be young judging by her reactions to the world around her and is an optimist. She is seen begging E to stop during the suicide text, to no avail. Once E stops responding, D starts to take long pauses in her sentences, seemingly broken.

Version 1
D doesn't appear in Version 1, but is mentioned in the suicide texts.

The Prologue
D is living with E in the prologue. She woke up before E and isn't in her room, instead being in the kitchen. E thinks that D is being stupid and doesn't understand what's going on, but D assures E that things will turn out fine. This eventually causes E to lose it at D, who in turn gets upset and leaves.

Chapter 1: The Phantom of Seisa
Once again, D is seen in the suicide text, witnessing E's suicide. This is her last appearance and it's unclear what happens to her after this.

E
E is the only person D's seen with. She cares deeply for E and wants her to know that things will be fine. This doesn't happen, and instead E ends up committing suicide, leaving a note at D's door. It can be assumed that she ran after E and found her in the middle of her suicide.

Trivia

 * D is never seen after The Prologue, and is only heard from in the suicide text. This leaves her fate unknown, as she doesn't even make a cameo appearance.
 * D is the only character who has an ahoge.