 If you liked
Ga-Rei
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 ...then you might like
Shinrei Gakuen Koihenge
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Shinrei Gakuen Koihenge gives off a Ga-Rei or Tokyo ESP vibe, likely due to similar art styles and spiritual themes of a female protag, a guy sidekick, and evil ghosts. SGK focuses more on romance (an assumption based on the first chapter), whereas Ga-Rei embodies action and adventure. Shoujo vs. Shounen!