Yuta is staying at his aunt Mizuki's house while studying for his entrance exams. He feels nervous and a little excited about living under the same roof with a woman other than his mother, but just when he thinks he'll start studying... He secretly arranges to meet an older woman on a dating site that a friend told him about. Feeling nervous, he arrives at the meeting place only to find that it's Mizuki! He is shaken when he finds out that the woman is his aunt, but he still begs Mizuki, the woman he admires, to take his virginity...