During the turmoil of World War II, Chieko Mochida and Toshio Anazawa find love despite their difficult backgrounds. They persist in their relationship through love letters, but their distance grows as Toshio joins the military to protect their country.
A tragic road accident affects Shinichi Nagakawa and an unfamiliar girl, who are given a chance to revive one if the other sacrifices themselves. Over seven days, they become closer and discover their true emotions and regrets.
Kenji Kuroda finally admits his feelings to his high school crush Hazuki Itou through a love letter. But when the letter reaches another girl named Azusa Itou, Kenji starts dating her instead. As he questions the fate of their relationship, his heart continues to waver.
