Yayoi, a college student, returns to her hometown for summer vacation. There, she reunites with old friends and they have a takoyaki party. Among them is the boy she has liked for a long time. After the party ends, Yayoi and he walk along a nostalgic path together since they are heading in the same direction. Suddenly, it starts raining. They take shelter in their former school. They enter the school building through a window that has always been unlocked. Even though it is summer, they feel the cold with their wet bodies. As they huddle together to warm each other up, their bodies naturally become entwined. Their feelings from their student days explode, and they continue having sex even after the rain stops, while reminiscing about their memories.