When childhood friends are left alone together, their usual relationship can't stay innocent for long. He shyly says, "Even if we're childhood friends, I'm still a guy... I get nervous going to your room," but in reality, she surprises him with a mature attitude: "I'm not a kid anymore either... I'm curious about that kind of thing, you know?" What was supposed to be a simple table tennis coaching session quickly turns into something far more intimate. Training includes blowjob practice in gym uniforms, playful teasing with an electric toothbrush in the shower, and orgasmic sex in school uniforms. The original goal of playing table tennis becomes secondary as they lose themselves in increasingly erotic exercises, sweating not just from physical exertion but from the growing heat between their hearts and bodies. A pure first love and uncontrollable desire collide in this intimate encounter between childhood friends.