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Tatsuya is a child born when Sayako was a college student. Sayako overwhelmed the opposition of the surroundings and raised Tatsuya with one female hand. Tatsuya who grew up got a job safely, but even at this age she does not bring any of her friends. Sayako was wondering, but one night she noticed that Tatsuya was mischievous on her body. Sayako, who thought that this should not be the case, invited her to a hot spring inn to set up a place for discussion.