 If you liked
Tasogare Otome x Amnesia
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 ...then you might like
Blood Lad
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Both are supernatural shounen manga with a ghost as the main female protagonist. The main male protagonist in both stories are alive and the female ghost protagonist is their love interest. The male protagonists in both stories are determined to achieve a certain objective for the sake of the female protagonist.
However, Blood Lad has strong action elements and has practically no human characters, whereas Tasogare Otome x Amnesia has strong mystery elements and has no demon characters.