What is Banishment Room?

Legal Definition
A banishment room (also known as a chasing-out-room and a boredom room) is a modern employee exit management strategy whereby employees are transferred to another department where they are assigned meaningless work until they become disheartened enough to quit. Since the resignation is voluntary, the employee would not be eligible for certain benefits. The legality and ethicality of the practice is questionable and may be construed as constructive dismissal in some regions.

The practice, which is not officially acknowledged, is common in Japan which has strong labor laws and a tradition of permanent employment.
-- Wikipedia