After graduating from high school, the young boy Shiro (played by Yuya Yagira) went to work at a gas station despite his parents' obstruction. The only person who supported him was his 70-year-old grandmother (played by Mari Natsuki), whose words and deeds were very Westernized. She also had a boyfriend in his 20s (played by Bolin Chen), who often taught Shiro how to fall in love, but the simple Shiro only half understood what love was. One rainy night, Shiro witnessed a girl arguing with her lover on the street. The girl's tearful appearance looked pitiful and helpless, which was deeply engraved in Shiro's heart. One day, a college student named Nori (played by Erika Sawajiri) who worked part-time at the gas station came to the gas station. She turned out to be the girl on the rainy night before. The feeling of love filled Shiro's whole body all of a sudden. Although Nori's emotions were always because of her ex-boyfriend (played by Kuraoka), Shiro still tried his best to please her. Nori was gradually moved by Shiro's sincerity, and she accepted this affection. Tasting the taste of love for the first time, Shiro and Nori were inseparable every day, and they even agreed to live together when they turned 19. But one day, Nori suddenly left without saying goodbye...