On the verge of taking his college entrance exams, Yuuichi felt a close bond with his aunt Mizuki, who had always doted on him since childhood, though they had grown distant after her marriage. This time, coinciding with his two-night, three-day trip to the city for exams and her husband's business trip, he found himself living under the same roof with her again after a long time. Reuniting with the woman he once loved as a child, Yuuichi noticed she seemed troubled and sorrowful, struggling in her marriage. Seeing her like this, he could no longer suppress his overwhelming feelings.