 If you liked
True Blue
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 ...then you might like
Grope: Yami no naka no Kotori-tachi
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Both series tell stories of women who have weak will and gradually became sex slaves (due to influence of males who are aware of their weaknesses and they take advantage of them), betraying their feelings to beloved ones. Grope ~Yami no naka no Kotoritachi~ and True Blue have rather bad endings, especially for main male characters.