Newlywed Yuuto suffers from a lack of libido due to his secret obsession with busty harems. To save their intimacy and conceive a child, his wife Sae takes a drastic measure by inviting her well-endowed friend, Emi, to join them in the bedroom. The arrangement proves highly effective, sparking a provocative new dynamic as Yuuto discovers that two busty women are exactly what he needs to regain his vitality.