 If you liked
Gouhou Drug
|
 ...then you might like
Ghost!
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Both have that supernatural element that makes a nice atmosphere, although Eerie Querie is getting worse through the chapters (story-wise, but it is still worth reading it if you are bored and need a nice, light, a bit funny and short manga to read). Elements of shounen-ai in both stories, more explicit in Eerie Querie.