Summer training camp for the swim team under the bright sun. A special period arrives where teachers and students engage in one-on-one, meticulous instruction from basics to advanced techniques. Innocent and naive girls learn to swim in their first school swimsuits. While struggling with the changes in their bodies, their emotions steadily grow more intense. The teacher notices their condition and guides them with both kindness and passion. Each physical touch brings strange new sensations. They let out breathy moans, yet still don't fully understand what's happening. From their private areas flows a thick, unfamiliar fluid, shaking both their minds and bodies.