 If you liked
Hataraku Maou-sama!
|
 ...then you might like
Strike the Blood
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Both have a main male character with great supernatural power, in positions that are seen as threats to humanity, which cause the main female character heroine to antagonize and supervise the main male character despite his upstanding, even heroic, behavior.
However, while they're both shounen plots, in "Hataraku Maou-sama!", the plot is light and comedic, and the romantic subplot is more subtle than it is in the more serious and harem plot format in "Strike the Blood".
If you like supernatural shounen titles with strong, upstanding male leads with sassy main female love interests, both are worth checking out.
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Recommended by PurpleLugia
Male protagonist is some sort of evil entity that the female antagonist is send to watch over / kill but she begins to befriend him. In addition to that, both protagonists lost their powers or are not fully aware of them. Timeline for both is modern Japan.