Yuto and Sae, newly married, seemed to be enjoying a happy newlywed life—until, unexpectedly, Yuto found himself unable to get an erection. The cause turned out to be his particular preferences for large breasts and harem situations. After learning this, his wife Sae struggled with what to do and eventually asked her friend Emi for help. Yuto initially hesitated at the idea of a threesome approved by his wife, but when faced with Emi—who, like Sae, is also well-endowed—his preferences for a “big-breasted harem” begin to take over…!?