This is a story about how each of the popular girls in high school ends up having sex with the less popular guys. Ain't that wonderful and completely unrealistic? Maybe. But we're just here to fap so fuck logic.
Yayoi is a sexually frustrated housewife with a workaholic husband who hasn't been paying her enough attention. She decides to use her sex toys, but it just isn't the same. She needs a real cockmeat sandwich. And she needs it now.