 If you liked
DearS
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 ...then you might like
Sakura-sou no Pet na Kanojo
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Both stories revolve around the male protagonist suddenly in charge of a female incapable of taking care of herself, that barely speaks a full cognitive sentence, and who loves melon bread. The development of the male's romantic feelings are slow and ecchi moments are abundant as more characters come into the picture because of said female's arrival to create a pseudo-harem.