One day, Kaori, who runs a private beauty salon, is invited to the home of a regular customer, married woman Yuu. From the first time they met, Kaori got along well and treated her as a good friend, but Yuu was not like that. Yuu had long had romantic feelings for Kaori and confessed his secret feelings to her, revealing everything. Moved, Kaori makes love to her and they make a promise. With each meeting, the two of them bond more strongly, using a double-headed dildo and a strap-on, but their happy time is not going to last long...