What was meant to be a brief stay with family in the countryside for the summer has been suddenly extended! When Nozomu's sister joins them, she finds her brother under assault from their tomboyish younger cousin Sou, and the antics are only escalating. As Nozomu learns to appreciate rural life, Sou finally starts to reflect on their "innocent" interactions. With the two getting closer, and with Nozomu's return to Tokyo fading into the distance, his lively days with his clingy cousin aren't going away anytime soon.