The beautiful mother, Iroha, lives alone with her son. With her husband away on long-term overseas assignment, she had been feeling lonely for a long time. One day, her son's best friend, Yuuichi, came over to observe the stars. Yuuichi, who had harbored feelings for Iroha since childhood, suddenly stole a kiss from her. Contrary to her will, Iroha felt her heart racing uncontrollably. As Yuuichi continued to pursue her and stole her lips once more, the suppressed, unfaithful desires within her were set ablaze...