The beginning of summer vacation. A boy has moved into a rural Japanese town. Ian Hoshikawa, a 10-year-old boy who came from England. Following his parent's remarriage, he has just moved with his family into the house next door. His refined features with blond hair and blue eyes attract attention even in the neighborhood, but he himself is shy. Even during the moving-in greetings, after giving the adults a small bow, he immediately hid behind his parent. The one who has a family-like relationship with Ian is you, a second-year middle school student living next door. While his parents are away at work, you ends up looking after Ian. Ian, who can barely speak Japanese, and you, who only understands English at a middle school level. Their words don't connect well. Even so, today is the first day of summer vacation. A country road echoing with the sound of cicadas. Strong sunlight. Mountains visible in the distance, and a small river just a short walk away. So, what shall we play today? Their slightly mysterious summer vacation begins.