 If you liked
D.N.Angel
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 ...then you might like
Suki na Mono wa Suki Dakara Shou ga Nai!!
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Sukisho is similar to D.N.Angel because they both have the 'alter ego' plot.
Aw, I see that someone else beat me to the recommendation... oh well. I feel like I have to make this. The whole time I was watching this, it just sorta screamed Sukisho to me. The whole two people-one body thing. And D.N. Angel feels like it sorta hints to shounen-ai. That might just be me. Sukisho=way more shounen-ai than D.N. Angel. But both are very enjoyable.