Do you know about the "world without guilt"? In this world, sex is as natural and routine as breathing. At work, at home, anytime and with anyone, people freely engage in sex, openly pursuing pleasure and routinely exchanging creampie after creampie. This story follows a family entangled with the son's homeroom teacher, the daughter's fiancé, and the fiancé's father, all living in a society where sex is an ordinary part of daily life. In their world, having sex with anyone is completely normal, and the story unfolds through the various events and emotions that arise within this lifestyle.