Mitsuki is a young girl who loves cunnilingus. "Pussy seems dirty, so I don't want to lick it..." Her boyfriend, who is the same age as her, refuses to perform cunnilingus on her. She gives up on cunnilingus with her boyfriend and posts a request on an adult dating site with the conditions "only cunnilingus, no sex, same age". However, most of the responses are for sex, and it's hard to find someone her age who will only perform cunnilingus on her. So she raises the age range to the 40s, which she dislikes, and easily matches with a man who will only perform cunnilingus on her.