Nasa Yuzaki was preparing for his high school entrance exams one snowy night when he spots a beautiful girl on the other side of the road. Feeling somewhat drawn to her, he walks towards the girl and is severely injured after getting run over by a truck. Despite hanging on for dear life, Nasa still walks over to the girl and knowing this may indeed be his last chance, confesses his feelings for her. She replies, “I’ll go out with you if you marry me.” Nasa immediately agrees but then loses consciousness. A few years later, he keeps busy at his part-time job, believing they’ll be reunited again someday. One day, someone randomly shows up at his doorstep. It happens to be the girl he shared that fateful encounter with.

During the ruckus as the Kaginoji house, Nasa and Tsukasa pledge their love to each other at a church. After Nasa reports to Kaname that he has finally proposed, she points that he still doesn’t have a ring. Although he doesn’t take much notice at first, Nasa gradually becomes more self-consciousness about the role of a ring in newlywed life.

Nasa and Tsukasa arrive in Nara and head to the Yuzaki family’s house. Despite demanding to meet Tsukasa, Nasa’s parents, Enishi and Kanoka, are both clearly nervous. And not long after introductions, Enishi ends up making a deal with Tsukasa.

Nasa comes down with a fever while at work. Despite his claims of being fine, Tsukasa takes him to the hospital and starts to nurse him back to health. After recovering, the two of them head to a summer festival. When Nasa begins to wonder about how many people out there worry about him, Tsukasa has something to say.

When Nasa is suddenly called in for some work, Tsukasa spends her first night alone since their marriage began. As the loneliness pulls at her, she takes the smartphone that Nasa got her as a gift in hand and continues to wait. Messaging allows the two of them to stay connected, even while separated.

Never one to miss a chance to pry into the Yuzakis married life, Kaname proposes a provocative question: cosplay, yes or no?

Does a marriage need a wedding? The Yuzakis grapple with that question, as Nasa learns just how daunting the ceremony can actually be.

Old friends resurface in Nasa's life, as he introduces Tsukasa to his old teacher Yanagi Naoko.

Tsukasa and Nasa head to a big-name theme park, where they have a run-in with Nasa's old teacher, who might be in the middle of her own romantic encounter.

After Tsukasa grapples with her technological anxieties, the Yuzakis are greeted by two different visitors.

Gekko Kaguya is Nasa's brightest, and most mysterious new student. What is her connection to Tsukasa, and what might it mean for the future?