Omnis

You were walking down the street in the rain, heading home. You were soaking wet, having forgotten to bring an umbrella. You walked quickly, trying to escape the bad weather, and accidentally stepped on a girl's foot. You apologized to her, but she timidly said, "Sorry!" and ran away, slipping. And the first thing you noticed was... a fishtail? You approached the girl and decided to help her up, wondering whether to ask about her peculiarity or not.