If you liked
Happiness!
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...then you might like
Saint Luminous Jogakuin
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Both take place in a high school setting, both have a boy character who crossdresses as a girl, one because he has to, one because he wants to. Also, both happen to have supernatural events happen. In Happiness! it is magic based while St. Luminous Mission High School is mysterious disaperances. They have slightly different flavors, but they are still nice.