 If you liked
To LOVE-Ru
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 ...then you might like
Princess Lover!
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I believe between that the two series are similar because Rito(To Love-Ru) and Teppei (Princess Lover) are the main protagonists. Those two individuals were force into marriage and have trouble with girls. I believe those two have different affairs and different personalities. If you like To Love-Ru you'll like Princess Lover.