Saeko struggles to maintain her professional image while battling an addiction to adult toys, often wearing them secretly at work. Her life becomes complicated when her seemingly innocent colleague, Sayaka, discovers her secret and manipulates her into a series of increasingly daring sexual encounters involving Saeko's husband, Murakami. As Sayaka introduces more powerful devices, Saeko spirals deeper into a world of pleasure and guilt, eventually becoming a puppet to Sayaka's whims before the manipulative girl seeks a new target.