When two persons combine themselves as one. Most commonly a boy and a girl, who are unrelated, but call themselves brother and sister.
The two persons, (boy&boy, boy&girls or girl&girl) make a vow as a brother and sister, scissors or bros. The circle, as they make, can only excist of two persons. If more, the circle is broken.
1. O-DI-AMA! (when the circle is created, you spell it out simultaneously)
2. Together, we're odiama. (statement that the person trust the other one with his/her life)