The Twin Shrine Maidens are twins from the female gender chosen to perform the Crimson Sacrifice Ritual. In the ritual, the younger twin must strangle the older twin, in order to unite the two as one.
The male version is called Altar Twins.
Known Twin Shrine Maidens
- Akane and Azami Kiryu.
- Yae and Sae Kurosawa.
- Mio and Mayu Amakura.