Dosei Mansion 5

Mitsu is a window cleaner on a ring-shaped orbital station that orbits the now-uninhabited Earth. His father, a window cleaner just like him, died 5 years earlier, and Mitsu has decided to take his job very seriously. Unfortunately, not all of his colleagues share his integrity; in fact, they begin to resent the care and diligence he puts into improving the view of Earth for the inhabitants of the Ring. One day, while supervising his colleagues' work, Mitsu loses radio contact. Will he also meet the same tragic fate as his father?