Old Border

"To us... Our purpose in the "Old Border" was to connect this world to the neighbors."

- Yuri Rindō about the Old Border.

Old Border (旧 ボーダー) refers to Border before it went public and prior to the death of 10 of its initial members.

History
Before it became publicly-known, Border was a secret organization with the purpose of being an intermediary between ‘Earth’ and Neighbors. To realize this goal, Border made an Alliance with three Neighbor nations where each vows to protect each other in the case of an invasion by hostile forces.

During its peak, Old Border has 19 people within its ranks. However, about five years before the start of the series, one of the allied nation was invaded by a hostile nation, and when Borders sent its forces to assist, 10 out of 19 members died, with some became Black Triggers.

Some time after the incident, the surviving members separated themselves into two groups, one went on and established the current HQ while the other stayed and established Tamakoma Branch.

Legacy
Following its separation, most of its foundations were taken by Tamakoma Branch. This includes the building it uses as headquarters, the emblem and its goal.