Nangoku Sakunyuu Island: Ninshin Sasete!? Chichi Shibori

The main character drifts ashore to a mysterious island inhabited solely by girls with large breasts. He is warmly welcomed by them and begins living among them. The island's economy relies on selling breast milk, a task performed by a dedicated milker. One day, the man responsible for this job disappears, leaving the girls in a bind. As a result, the protagonist is forced to take over the role, discovering that his new duty involves intimate acts with the girls. His life on the island becomes a daily routine soaked in milk, where business and pleasure blur.