All roles are performed by adults. Makoto has spent three fulfilling years living at a school dormitory and has now graduated as an adult. Because Mariko, the woman he once desired, married his father and became his stepmother, the awkwardness kept him from visiting home. Then Mariko unexpectedly arrives to celebrate his graduation. That night at the hotel, she gently kisses him and says she has a present for the grown-up Makoto. Guided by the stepmother he has always longed for, he takes another step into adulthood.