sooooo i really gotta say this the main character is a really really stupid there is a girl who loves him and by the way she's an alien and a princess(the heir of the deviluke kingdom more like intergalactic lol)
so story goes like this :
there is a guy that lives normally but one day a girl from space teleports herself from space to our main guys bathroom while he's having a shower.well then he grabs her boobs(accidently by the way that means a marrige proposal lol :D:D)then the guys from space tries to take the girl back to the kingdom but our guy don't let them take her away...
well it's a really cool anime if u love ecchi,action,romance,and crazy inventions :D:D:D and of course harem
a must watch !!!!!