Son Jun could hardly hide his surprise when his mother's friend, Chisato, suddenly showed up. Though deeply moved by her mature charm, he struggled desperately to keep himself under control. Yet touched by Jun's sincere feelings, Chisato convinced herself it would only last one night as she secretly gave in to their growing intimacy. The next day, unable to resist, Jun pleaded for "one more time." Though Chisato told him they should stop, she ultimately succumbed to his youthful passion. But such a relationship couldn't last forever, and before long, it came to an end.