 If you liked
Kenkou Zenrakei Suiei-bu Umishou
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 ...then you might like
To LOVE-Ru
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While one deals with outerspace aliens, lots of ecchi and humor and the other one deals with swimming humans and lots of ecchi and humor.. there's not much of a difference in it. But the animation in Umisho is on a higher level than the one in TLR, the story's are different but characters deal similarities.