Trouble Chocolate

Trouble Chocolate is a parody anime series that openly mocks many popular tropes of anime at the time it was produced. It features numerous bath scenes throughout, including an entire episode devoted to girls being kidnapped by a vampire while bathing.

Episode 7
The male teacher Professor Ghana takes a bubble bath.

Episode 9
Episode 9 features a storyline involving girls being kidnapped while bathing and features a few bathing scenes, mostly with Deborah.