雨の止まない放課後に助けた美人な先輩が完全に病んでいた件 (Associated Names)

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…