In Keijo, the term Sœur (スール, Sūru) means "master and apprentice". Rookies or newcomers will realize that they are lacking of experience. Thus, they need a mentor to train and guide them to become stronger. The agreement required from both sides to officially become soeur. A mentor is allowed to pick more than one player to become their apprentices.
They are not limited by their fighting styles. In other words, an Outfighter is allowed to be mentored by an Infighter (or vice versa). This system is established with the aim of preventing rookies from getting fatal injuries. Upon officially becomes soeur, a player will start addressing their mentor as "Onee-sama" (お姉さま, Onēsama), as a sign of respect.
List of Soeur
The following is a list of known Soeur.
|Kyoko Shirayuki||Hanabi Kawai|
|Sumire Sakuragi||Nozomi Kaminashi|
|Meiko Ginya||Jin Mutou|
|Ai Shinonome||Kotone Fujisaki|
|Misaki Rindou||Kukuru Kashiwaba|
The following is a list of Soeur, which, has been disbanded due to certain reasons, such as retirement and injuries.
|Riko Ichikawa||Sumire Sakuragi|
|Sanae Kirieda||Kyoko Shirayuki|
|Hitomi Hokuto||Suzuho Kato|
- Sœur is French for "sister".