 If you liked
Akutoku no Sakae
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 ...then you might like
Bitoku no Fukou
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Both have the same artist/author (Mangaka). Both stories and the art are very dark, twisted and extreme. Some similar plot lines about breaking down the captive central characters through continued sexual abuse. The younger and older sister in Bitoku no Fukou and the mother and daughter in Akutoku no Sakae “spirited away.” Fans of one would likely enjoy the other.