- Sabine Brighton is Tess’s sister
- She is a "Cult Deprogramming Therapist" – Alice is a patient of hers
- Works in the same facility where Kumiko stays
- Very concerned about Tess’ mental health, and her obsession with having a child
- Attempting to help Taka
- Is also exploring a romantic relationship with Taka
- Sabine and Taka are continuing to explore a romantic relationship, but her concern over Tess and the discovery of an abundance of His Name Is fliers is beginning to interfere with their progress.