As Natsumi has her hands full with tennis, studying and looking after Daiki while her mother's away, Yuka, Saki and Rinko make a wish on the rock which causes there to be two exactly alike Natsumis. While both are obviously displeased with the arrangement, the two Natsumis quickly start putting good use to the new development by using it to get things done, with one Natsumi doing tennis practice and the other doing homework and chores...