Despite being siblings, they engage in mutual masturbation. (Moriya Yoshino SDJS-370)

[SOD Create female employee, General Affairs Department Secretary Yoshino Moriya, makes her drama debut!] One day, her younger brother suddenly shows up at her door with a large suitcase. Although his free-spirited nature leaves her bewildered, she can't ignore him, and they begin living together. However, a certain incident leads her to start helping him masturbate. Despite being siblings, their relationship gradually intensifies, becoming increasingly excessive…