One day, during a record-breaking heatwave, Yumi, who had just returned home from shopping, lost her hands due to her sweat and dropped her bag. Then her neighbor, Tamura, arrived, and while the two of them were picking up fruit... sweat ran down Yumi's neck and into her cleavage. Tamura's gaze was glued to Yumi's chest, as if drawn in along with the sweat. There... was a nipple, asserting its presence powerfully from under her clothes! (But why a nipple... could it be that she's not wearing a bra!?) Once he noticed, Tamura's mind was completely taken by her braless breasts...