 If you liked
Rosario to Vampire
|
 ...then you might like
Deadman Wonderland
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While these two titles may not be as similar as you think they are, it still deals with a main character that "gets trapped" in a certain place where they didn't want to be but still stayed for a reason (in a slightly different case for DW, though).
Plus, both mangas have a character with a split personality "sealed" in them.
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Recommended by Marbella25