Angely Mountain (エンジェリーマウンテン) is a location that was first visited in Episode 09. It is where Angely Sugar's headquarters is located. Despite the lack of given information about it, it is has appeared a few times in the series, serving as an important place for the characters when needed.
Angely Mountain is a very secluded area within a forest with very tall pine trees. There, a high-speed elevator was built up to take people all the way from the base of the mountain up to where Angely Sugar's headquarters office was.
There was another path, if not the elevator, that leads to the clfifside of Angely Mountain, in which all other people had to climb up the cliff in order to get to the top of Angely Mountain.