What's this anime on the DVD cover in part of this photo?
Searching for the image resulted in this title 影のセクハリスト ～孕ませ王位継承騒動～, which roughly translates to Sexual Harasser of the Dark ~ The Impregnation Mayhem for Throne Succession ~

Here is a clearer version of the cover (NSFW).

Here is the link to official website (NSFW) and its entry on vndb.

It seems to be a eroge, not an anime, though.

The site describes it as a "magic school slapstick love comedy".