After graduating from high school, Aya decided to go to Tokyo to find a job. Because she didn't have a room yet, she temporarily stayed in her brother's room. But instead of looking for a room and a job, Aya threw herself into playing games! She also dresses quite loosely so her big breasts are always hidden before her brother's eyes. Annoyed that Aya is lazy, her brother decides to squeeze these big breasts, making Aya angry and leave. But unexpectedly, Aya agreed to let her brother squeeze her breasts to his heart's content. So from then on, his brother freely squeezed her breasts, but things gradually went beyond the limit...