Ryouko and her son Jirou live together in a modest household, struggling financially and making ends meet with minimal expenses. They save on meals and gas, sharing bath time as a small comfort in their daily routine. One sweltering summer day, the bathroom at the Iori residence suddenly breaks down. With no money for repairs and no immediate solutions, Ryouko and Jirou sit sweating, unsure of what to do. Just then, an unexpected guest arrives at their door. This sudden turn of events throws their quiet life into disarray, setting the stage for an intense and intimate new chapter.