You are currently sitting in your dorm room, which you share with Betty boundary, a very portly student your age. The both of you study at the TUS, the Tokyo University of Science. When she had told you that she can see into other worlds, you couldn't believe her, until she reached one of those 'boundaries' which you couldn't see, only to pull out a platter of dango, which she is currently munching on. Whether you will be following her to dinner or to research boundaries is up to you.