The story of a lesbian triangle tour in which three good cousins [Emiko and Miki] and an aunt [Momoko] go hiking in Asago, Hyogo Prefecture, to see a castle in the sky. Miki and Momoko, who have a passionate lesbian relationship, plan to make their cousin Emiko a lesbian captive. A play that is lewdly entwined with the extremely delicate white skin of three mature women who are perfectly compatible in body and mind.