When I go back to the countryside for the first time in a while, the kids I used to look after come running up to me innocently. They all have tan lines from their school swimsuits at the pool during summer vacation. Even though they live in the countryside, kids these days are more precocious than adults, getting information from the internet and social media. Seeing them defenselessly showing off their developing bodies makes me, still a virgin, secretly get an erection. The girls notice and tease me. Ran is a girl who has just woken up to sex and is curious about it. Kana and Akari are best friends who are students and have a lot of experience. During summer vacation, I lose my virginity to a tanned girl who is more than a decade younger than me.