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After a brutal fight with his wife, Yusei's wife left him, leaving him at a loss. Unable to bear seeing Yusei like that, his wife's sister, Serino, volunteers to mediate. It's reassuring to have the beautiful and caring Serino help out. While Yusei is happy to have a reliable ally, Serino is vigilantly waiting for Yusei to relax. Eventually, Yusei, who seems to have been completely seduced, is invited to take a bath, and Serino also takes off her clothes...