In front of Kyoto Station, Yukihira Itsuka mistakes Irino Nagomu for her missing father. She never imagined that he was the son and heir(?) to a wagashi shop called Ryokushou—the same shop where she's been staying. When Nagomu and Itsuka begin working together at Ryokushou, they run into a little trouble.

Horikawa Mitsuru, a high school student, works at Ryokushou with Itsuka. Seeing the two of them chatting happily together by the sink makes Nagomu feel a little jealous. While Mitsuru works part-time at Rykoushou to help supplement her large family's finances, she's also actively making music. And her musical activities kick up some trouble.

On a day off from work, Itsuka and Mitsuru run into Nagomu's ex-girlfriend, Matsukaze Kanoko, in town. Mitsuru and Kanoko haven't met before, though Itsuka knows them both. The three decide to have lunch together. Mitsuru and Kanoko both get excited talking about Nagomu while Itsuka is perplexed by the unusual atmosphere between the two women.

Everyone at Ryokushou is participating in the Miyama school district's sports festival. Itsuka feels shy and awkward around Nagomu, causing her to adopt a brusque manner toward him. But in his loud cheers of encouragement she feels the warmth of family. Nagomu's father, Heigo, gets overly fired up and ends up hurting himself. Nagomu and Itsuka have to step up to take his and Nagomu's place in the parent-child event. Meanwhile, at Ryokushou, a woman calling herself Itsuka's mother appears.

Kanoko followed Nagomu to Kyoto, but back when they parted ways, she'd been stubborn and said, "I like Western sweets better." Faced with that, she can't find a way to be upfront and cheer Nagomu on now. Meanwhile, Nagomu begins kicking up a fuss about losing his headgear from his band, Chestnut Manju. With Kanoko and Itsuka's help, Nagomu searches for it, but...

One day, with Christmas near, a message and a fir tree sent by Itsuka's mother arrive. Remembering back to the broken promises from when she was little, Itsuka is afraid to make another promise with her mother. But Nagomu's words give her a push, and she tells her mother that she'll be waiting. Yuzu yokan causes Nagomu to remember a conversation he had with his grandfather.

Nagomu is laid up in bed with a cold, and as his consciousness grows hazy, he remembers a senpai from his school days who went off to Tokyo to chase a dream. That night, as Itsuka tends Nagomu, she glances up through the window and sees snow fluttering down. Snow on the day before Valentine's Day. Seeing the snow piling up on the ground, Itsuka is reminded of the day when she was first left in the people of Ryokushou's care. Itsuka doesn't have good memories of snow. Nagomu makes some new ones with her, building snowmen.

For Itsuka's birthday, Nagomu uses his "Going Somewhere Together" ticket and takes her to Hirakata Park. While out with Nagomu, Itsuka's remembers when she went to the park with her father. When they get back to Ryokushou, they find a wagashi cake and birthday party for Itsuka waiting for them. Itsuka always seems to be chasing after the shadow of her father. Concerned, Nagomu comforts her. And in reply to Nagomu's words, Itsuka...