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In 1937, Takemasa and Natsumi look back on the early days of their marriage—a time when shyness kept them from expressing their true feelings, leading them to rely on letters to reveal what was in their hearts. As the secrets within these letters come to light, the couple experiences both romantic and awkward moments, enjoying a quiet life together—until an unexpected event changes the course of everything.

In 1937, as the shadows of war loom, Fuyuko unexpectedly arrives at the home of her elder sister Natsumi and her husband Shu, fleeing an argument with their sister Harue and seeking refuge for the night. Despite her own slight loneliness over having less private time with her husband, Natsumi warmly welcomes her. The following morning, Fuyuko tries to help with household chores but makes a few clumsy mistakes; Natsumi gently encourages her when she becomes discouraged, and then agrees to teach her how to knit warm clothes for soldiers' care packages. While knitting, Natsumi casually asks about their childhood friend Seta, causing Fuyuko to break down in tears and reveal the painful secret behind her distress: Seta has been sent off to war.

As the tide of the times—marked by Seta’s (Rio Komiya) departure for the front—closed in, Fumiko (Erika Ikuta) and Fukami (Yuta Koseki) joyfully celebrated their wedding.

Natsumi (Kyoko Yoshine) and Takemasa (Kyoya Honda) travel to Nikko in Tochigi Prefecture. While enjoying a peaceful and pleasant time near the Kegon Falls, they accidentally become separated. Deeply worried about one another, they search frantically, yet they narrowly miss crossing paths time and again. Amidst this, Natsumi receives help from a man named Machida (Yuki Izumisawa), an artist. Through this separation, both Natsumi and Takemasa come to realize just how valuable the other person is in their life.