Level E is a tV series anime that premiered in winter 2011, produced by Studio Pierrot.

About the production: the story comes from a manga, there are 13 episodes of about 24 minutes and its current status is "finished".

Its main genres are comedy and sci-fi, with themes such as Aliens, Meta, Episodic and Mermaid.

On AniList, Level E has an average score of 71%, a good score, and appears on 21,226 users' lists.

Hundreds of aliens inhabit our Earth today. Some friendly, some belligerent - some are here for research purposes while others came for the sake of committing crime. It is only us humans who have yet to realize their existence. One day, a hell of a troublemaker arrives on our planet. Though he is regarded as the smartest man in the universe, he has a major flaw in his personality - he is always causing trouble to bide his time. (Source: Crunchyroll)

Official synopsis from AniList.