Fire Tripper

Fire Tripper is a one-shot manga by Rumiko Takahashi later adapted into a single 50 minute OVA. Fire Tripper was more or less a prototype to her later (more popular) series Inuyasha

Fire Tripper (manga)
Suzuko bathes in a lake to wash herself off while she talks to her male companion, Shukumaru about her past. He sees her naked while they talk and then she throws a rock at him for peeping at her, although she quickly gets over it and smiles.