After school on a rainy day, Sagara Toma leaves school soaking wet and without an umbrella. Then, he comes across Kayamori Chifuyu, one of the most beautiful girls in school, being attacked by a pe*vert, and saves her life. The next day, she comes to him to thank him for saving her but…… How far will the differences between the spectacularly sick girl senpai and the perfectly normal, ordinary boy go? Can Sagara withstand Kayamori’s heavy love?