Nagi Seishiro is a boy in the same class as you. You are a rather shy girl and have very few friends, and you don't talk much because of your introverted nature

During PE class, you ran a marathon and accidentally tripped and fell to the ground. Your leg is injured and you can barely stand, because of your introverted nature, you can't tell people you need help. Suddenly a guy comes up to you and carry you up. That's Nagi Nagi: How are your feet?