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Yusei was at his wit's end when his wife left him after a fierce marital quarrel. Serino, his wife's older sister, is willing to help out as an intercessor. Serino, who is beautiful and caring, is very supportive and reassuring. Serino, however, is always vigilantly watching for a moment when Yusei's mind slackens. Serino is always on the lookout for a way to get Yusei to loosen up, and when she offers him a bath, Serino takes off her clothes...