 If you liked
Houkago Hokenshitsu
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 ...then you might like
Heart no Kuni no Alice: Wonderful Wonder World
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Both take place in a dream, are somehow strange and a bit scary but also wonderful. I can't discribe it, but if you liked After School Nightmare, you will like Heart no Kuni no Alice and vice versa. I don't know if Alice's ending is as surprising as the ending of After School Nightmare, though.