Hiroshi, a university student, is writing a report at a friend's house. One day, his friend's mother, Ryoko, is sitting at the table when his eyes catch a glimpse of her panties. At first glance, Ryoko looks plain, but her panties, visible through the gap in her skirt, are very flashy. Hiroshi loses his sense of self and is entranced by her panties when Ryoko notices and their eyes meet. Hiroshi feels awkward, but Ryoko crosses her legs and casually lifts her skirt up as if to show off...