Noa, an active swimmer from a swimming club, agrees to a photoshoot for a promotional magazine feature. By simply consenting to be photographed in swimwear, she unknowingly falls into a trap that turns her into a slave of competitive swimwear. Forced to change into various versions of the high-tech racing suit "Top Impact" developed by as○cs, she is repeatedly humiliated and dominated. Gradually, the athletic girl Noa transforms into an intensely lewd slave of competitive swimwear. Here begins the forbidden game of sexual slave training!