Mirai, a wife, feels empty in her sex life with her selfish and overbearing husband, and lately it has become her daily routine to comfort herself with her own body. Unsatisfied with her own fingers, Mirai secretly buys a vibrator from her mail order...and her father-in-law, Kozo, finds out! ``Will you teach me how to use this, Mirai-san?'' Kozo approaches Mirai. The future was aching with her frustration,