 If you liked
D.C.: Da Capo
|
 ...then you might like
Yosuga no Sora
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Both are based off of visual novel and both have incest. While Da Capo is funny, Yosuga no Sora lacks itself on the comedy side. But Yosuga no Sora has nudity and more perverted stuff. And last but not least: Both have Harem!