Story: Detective Conan
Main Character(s): OC, Conan/Shinichi
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Haunted
Edogawa Conan is losing his disbelief in supernatural when a girl his (apparent) age starts floating around him (literally) asking to be friends. He hasn't found out if she's a ghost or not (he doesn't want to). The girl isn't telling and why can Kaitou Kid see her too? (And there are some shady, literally shady, characters wanting to capture her). Where does all this lead?
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The first random idea. It's written a bit like a summary. At least that gives a lot of freedom to work out your own plot.