Jun, a son, is surprised by the sudden visit of his mother's friend, Chisato. Although he is tormented by the adult sex appeal that she exudes, he tries to control himself somehow... Chisato is touched by Jun's sincere feelings and tells himself that it will be a one-night stand, and they have a secret relationship. The next day, Jun can't hold back and begs for it "one more time." Chisato tells him to stop, but is swept away by the young man's intensity. However, their fleeting rendezvous will Itsuka come to an end...