Ryo returns to his parents' hometown during summer vacation and meets Mana, a dark-skinned gal. "<i>The gal I just met... Her boobs were big...</i>" Ryo can't hide his surprise at the presence of a grown-up dark-skinned gal in the countryside, where he thought it would be boring. That night, by chance, Ryo gets Mao to satisfy his curiosity about sex...