Noboru Amakawa, having lost all hope, ventures into a deep forest where he encounters a woman of indescribable beauty. Stunned by her appearance, he loses his balance, falls off a cliff, and loses consciousness. Upon awakening, he finds himself surrounded by horned women who sexually assault him repeatedly. He is overwhelmed by their hip movements and smothered by their large breasts, describing this world as a “breast paradise.” Furthermore, after drinking the breast milk from Daki, the village chief, Noboru finds that his virility remains perpetually active, keeping him continuously erect. He’s filled with happiness at the Nyuuson celebration.

Noboru Amakawa has the mission to sire ten thousand demon girls, as ordered by Kirika. In a village where girls can transform into demons if their breasts grow too large, sexual desire is directly linked to breast size, causing them to lose control.

Noboru Amakawa, tired of his procreation routine, seeks relaxation at a small village onsen. Upon arrival, he encounters a group of oni girls in the bath, eagerly awaiting him. The onsen water is infused with the breast milk of these girls, which heats up and excites Noboru’s body, leading him to decide to explore and enjoy every pair of breasts in the village.

Secretary Kirika has always been cold and professional towards Noboru Amakawa, but as a busty oni girl, she ends up begging for his semen. At that moment, Dakki, the village elder, appears. Although she scolds Kirika, she can’t hide her own desires and ends up reaching ecstasy while mounted on Noboru’s lap. Meanwhile, the truth about the village comes to light: all the men in the village died after having all their semen and life essence drained. Even after hearing this terrifying reality from Shirohime, Noboru doesn’t hesitate for a second… he prefers to continue living his life in this paradise of breasts and absolute pleasure.