Gakuen Mokushiroku -

The series is famous—and often controversial—for its combination of:

Watch this legendary scene that demonstrates the show's over-the-top animation style and fan service: Gakuen Mokushiroku

The series is a well-known example of the ecchi genre, frequently using physics-defying animation and "bullet-time" slow motion for suggestive scenes. Gakuen Mokushiroku