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.

Nasa and Tsukasa have submitted their marriage registration. As the newlywed couple approaches their first night together, they realize Nasa’s apartment doesn’t have enough necessities for two people, leading to Tsukasa suggesting she spend the night at a hotel. But Nasa stops her, and proposes they go shopping instead. After returning home, Tsukasa sleeps relaxedly while Nasa is tense with excitement from seeing a new side of his wife.

Nasa and Tsukasa take an overnight bus to visit his parents in Nara. They attempt to enjoy the trip like a honeymoon, when Chitose shows up at a service area, asking to know why Tsukasa married Nasa, who happens to overhear the conversation and begins to wonder the same thing. As the couple attempt to enjoy seeing the sights in Kyoto, Chitose appears again. She attempts to test Nasa to see if he’s worthy to be married to Tsukasa, and he explains why he decided to marry her.

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?

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