My girlfriend, who is living with me, went on a four-day family trip. In my lonely house waiting for her return, a sudden visitor appeared... It was the figure of her sister, Saeko-san, who couldn't go on the trip due to work. "Why... why...?" While I was bewildered, Saeko-san began to tempt me... A record of the four days when she was away on a family trip, and I was crazy about it.
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