Where can I find this video?

This is an anime not a hentai. It's called Taimadou Gakuen 35 Shiken Shoutai and the scene is from episode 6.

Here's link to episode 6: (the scene is about 22:42 in)

https://kissanime.to/Anime/Taimadou-Gakuen-35-Shiken-Shoutai/Episode-006?id=119431

Here's link to other episodes:

https://kissanime.to/Anime/Taimadou-Gakuen-35-Shiken-Shoutai

This is an anime not a hentai. It's called Taimadou Gakuen 35 Shiken Shoutai and the scene is from episode 6.

Here's link to episode 6: (the scene is about 22:42 in)

https://kissanime.to/Anime/Taimadou-Gakuen-35-Shiken-Shoutai/Episode-006?id=119431

Here's link to other episodes:

https://kissanime.to/Anime/Taimadou-Gakuen-35-Shiken-Shoutai

The anime is "Taimadou Gakuen 35 Shiken Shoutai"