Yoko was enjoying her single life at her parents' house, but when she turned 40, she decided to move to Tokyo and live alone. A few days later, when Yoko went to Tokyo for an interview at a company, she happened to meet her first love, Isao... That night, when Yoko complained that she couldn't decide where to live, Isao invited her to Ito to his house, where he lives with his divorced son. Although Yoko felt bad about it, she ended up visiting Isao's house, but as soon as she saw Isao's son, Shinji, memories of her first love from back then came back to her vividly...