Naga

Gracia Ul Naga Saillune, aka Naga Whitesnake or Naga the (White) Serpent, is a character from the Anime Slayers and the older sister of Amelia.

She has a bath scene in the company of Lina Inverse in the "Slayers Perfect" movie. She and Lina are trying out a public swimming pool/hot spring which is a legendary local tourist attraction. Naga discovers a plot to cheat on the customers, leading to a bathhouse battle between the girls and the manager of the amusement park.

Towards the end of the movie, Naga can be seen chasing Lina down the beachside after the latter had a bath attempt.