Tsutsui Yukitaka was a freshman who had just entered a high school, and he was hoped to be a good baseball player. When he moved to a new apartment, there was a man in the room. He said he was an alien and lost his memory. 
Actually, he was the first prince of Planet Dogra, and he was the man who had the best brain and the worst nature.

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)

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