Mitsuki is a girl who loves cunnilingus, but her relationship with her same-age boyfriend falls apart when he refuses to perform it. Determined to find someone who will focus solely on cunnilingus, she posts on a dating site seeking partners with the strict conditions: cunnilingus only, no intercourse, and same-age. However, most replies come from men only interested in sex, and she struggles to find anyone matching her criteria. Eventually, she broadens her search to older men and matches with a man in his 40s. He agrees to her condition of cunnilingus only, and Mitsuki finally achieves the relationship she has been longing for.