At the end of summer vacation, our protagonist Kou goes hiking in the mountains with his childhood friend Yuri. Reuniting with her after a long time, he can’t help but notice how much her body has matured. Tired from the climb, Kou takes a break and dozes off. When he wakes, he finds his head resting on Yuri’s lap…? With just the two of them alone, a heart-throbbing and inevitable romance love begins, binding them together deeply!!