The protagonist, Izumo Hiroki, is a university student who is tired of living in the city. He returns home to the countryside during the summer holidays. His parents have left the countryside and only his grandmother remains at home. Incidentally, Hiroki's presence always seems to bring rain. Today, too, the skies were overcast from the moment he got off the train. He headed for his parents' house as fast as he could and barely evaded the evening showers. When he returned home, he met his soaking wet childhood friend, Inaba Usaki. "Welcome home, Hiroki! We'll be seeing each other again from today onwards!" For one summer, the two are under one roof. The companionship of a bright and lively childhood friend inspires affection in Hiroki's heart. And the fondness turns into love...