I'm surely going to butcher this story, but I heard from a Zen priest who visited Mount Hiei this year that there is a position there of a monk who maintains a

I'm surely going to butcher this story, but I heard from a Zen priest who visited Mount Hiei this year that there is a position there of a monk who maintains a (the?) main shrine. That monk attends to the cleanliness and order of the shrine exclusively, and resides there without leaving throughout the entire duration of the position, which is 12 years.