The story revolves around a young man who becomes the older brother to his new step-sister, "this ka". This girl has an embarrassing secret - she's not yet potty trained and must wear diapers. Despite her insecurities, they grow closer as siblings. However, it soon becomes apparent that this sister harbors more than just sibling feelings towards him; their relationship is tainted by inappropriate desires on her part. As he tries to maintain some semblance of normalcy while dealing with these unwanted advances, viewers are treated to intimate scenes involving adult themes such as urination (Urination) and other fetishes (Other Fetishes). The video promises to be a unique blend of realism and fantasy, showcasing both the challenges and taboo aspects of their unconventional bond.