The monthly rent is 700$, and the main character (Hakiko) living in Tokyo and his younger brother 'Juho' who is taking care of him. Two people who work hard for tomorrow accidentally discover an unknown space in the ceiling. I find a boy in an unknown space and decide to follow him. Following the boy, I saw a mountain-shaped hotel. In the mountain-shaped hotel, there were a variety of people living, such as job seekers and aspiring chefs. What will happen in an unknown space such as Juho, the main character, and a small society? What kind of story is waiting for them.