 If you liked
High School DxD
|
 ...then you might like
Maoyuu Maou Yuusha
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Although taking place in different settings, both series involves a main male protagonist meeting a female protagonist in the pilot episode where their lives change forever.
There is romantic and dramatic tension between the duo that also involves some other supporting characters.
Both series also has fantasy themes as well as some action, drama, and humorous dialogues.
The main male protagonist have similar personalities while the main female protagonist treats the guy with kindness and compassion.