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Her husband has a younger sister who is the youngest of his kind... She's been spoiled since she was little, and her brother has always given up everything for her... But he never imagined he'd end up giving up his own wife as well!?... When Rena, who has come to Tokyo to continue her studies, lives with her, Nana, a beautiful wife, falls into a forbidden relationship between her stepsisters... No one can stop their relationship now...