Riho was put in charge of taking care of her nephew, and at first, everything was innocent and pure. However, as time spent together increased, his behavior gradually began to change, as if their physical contact naturally escalated. When they bathed together, he unconsciously started touching Riho's breasts, causing her to unintentionally become aroused. Noticing her reaction, the nephew grew bolder and increasingly out of control—fondling her breasts late into the night and creampieing her repeatedly, even inviting friends over to join in the sexual harassment. Trapped inside the house with no escape, Riho is cornered by the lustful brat, forced to endure the relentless, animalistic thrusting of the now depraved boy. Ultimately, she is completely dominated, repeatedly filled with creampie after creampie, pushed into a situation from which there is no return.