The ritual uses Twins, typically 15 years of age. Although in several circumstances, younger twins can be used (Ex. Akane and Azami Kiryu). The people of the village believed that twins were one soul split into two. Strangling one's twin was thought to 'unite' their souls and to make them become one. The energy unleashed during the ritual appeased the Hellish Abyss and prevented the Repentance from occurring.