 If you liked
High School DxD
|
 ...then you might like
Sword Art Online
|
DXD and Sword Art Online are similar in one significant factor. Unlike the majority of animes with romance, these two shows actually develops their main's characters affections for one another and you get to watch them grow in their relationships, as well as deal with various trials and tribulations.
Also, both have a male character with a harem.
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Recommended by migueltc98