The reason is simple, because—
This is the place where their leader, the Yama Association Leader, likes to spend time.
The senior members generally know that their leader dislikes interacting with outsiders and avoids crowded gatherings. Thus, when handling affairs, she typically brings along "Impermanence Envoys," high-ranking individuals personally selected and trusted by her.
Compared to the Leader, the Impermanence Envoys holding the Yama Order handle the internal operations of the organization. Currently, there are five of them, all Class A Curse Forbidden Masters. When the Leader appears in the book house, she usually picks two to accompany her.
Today, those on duty are a cold woman with a scar on her face, and a man in a deep brown jacket, around fifty years old.
The two sat facing each other. The man was reading a newspaper, while the woman flipped through a magazine. The atmosphere was quiet, and for a long while, neither spoke.