After his parents' separation, Akira was placed under his father's care, eagerly awaiting the coming Sunday—the day he would reunite with his mother, Kyoka, after a long separation. On that day, Kyoka rushes to Akira with open arms. Desperate to fill the void of their year-long separation, they passionately fulfill each other's desires. For the next 24 hours, until the father returns home, the two spend their time completely naked, indulging in intense, back-to-back climaxes—an intimate, incestuous reunion between mother and son.