Shortened from Enjo kōsai (援助交際, literally meaning "aid or support" and "congress, intercourse, intermingling") (gyaku enjo kōsai (逆援助交際; gyaku 逆 meaning "reverse")
Enko's main building is a building that seems like an office building from the outside, but inside is a lavish ornate lobby with a winding staircase. Enko has been around for several decades, forever under Yara's care.