Idol Reiko is secretly dating her manager, Eiji, and her career is going smoothly. However, she has a major secret: she's been servicing her shut-in older brother, Yukio's, sexual needs for years. One day, Reiko is forced to reveal their relationship to Eiji through an audio recording. After that, Reiko loses her job and her life spirals out of control. The twisted daily life of the trashy brother and his sister, the sister squeezing her brother's cock inside her pussy, their incestuous relationship approved by their father... how long will this abnormal routine last...?