Yui, who lives with her stepfather after her mother ran away, is forced to play erotic games with her. Her father enjoys watching her shaved mound of underwear, and the flesh of the mound, and he massages his daughter's body under the pretext of a massage. The stepfather's desire doesn't end with just watching, he thrusts his rock hard cock into the slit of her vertical flesh and has sex with her, making her do it in a cowgirl position.