[DeepL Translation - needs review] Introduction to Volume 1: In an age when the entire earth has become a nature preserve and no one is allowed to go down to the ground. Mitsu, a junior high school graduate, was born and raised in the ring system, a gigantic structure consisting of an upper, middle, and lower layer that surrounds the earth at 35,000 meters above the earth. Upon graduation, Mitsu takes a job as a window washer in the ring system, the same job as his late father, and while har...
