One day, her stepsister Reiko came to stay. After enjoying a reunion with Yumi, Reiko, who had been suffering from a cold, fell ill and was bedridden. Yumi devotedly looked after Reiko, feeding her porridge, but gradually her hidden desires began to awaken. Then, she kissed the moist lips of the sleeping Reiko, dragging her hesitant stepsister into the world of lesbians...