Konna Azusa, the desperate landlord of an inherited apartment complex, agrees to become a "special experimental slave" to prevent her last remaining tenant, Moriyama, from moving out. Moriyama takes advantage of her desperation, using a mysterious invention to heighten her sensitivity and subjecting her to increasingly depraved sexual experiments, eventually involving his underclassmen in the ordeal.
After struggling with the lingering effects of Moriyama's drugs, the Landlord is tricked into taking another substance that heightens her breast sensitivity to an extreme degree. Overwhelmed by intense pleasure and a growing dependency, she agrees to participate in Moriyama's college experiment. Subjected to relentless stimulation and sensory overload, she eventually loses all resolve, surrendering completely to her new role as an experimental slave.