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’s newlywed life has finally begun. The two of them head to a bathhouse run by a girl who went to middle-school with Nasa, Arisugawa Kaname. Kaname is shocked to see Nasa with a girl, and is curious about what happened after learning about the marriage. Meanwhile, Tsukasa heads into the bath and encounters Kaname’s sister Aya. When she asks Tsukasa about her connection to Nasa, Tsukasa replies that they are family.

As Tsukasa waits for Nasa to return home, a young girl named Chitose, who calls her “Nee-sama” confronts her. Chitose asks for Tsukasa to come home with her, and after being ignored, encounters Nasa. He tries to cheer her up, but after learning that Nasa is the one married to Tsukasa, Chitose’s attitude suddenly changes. As Nasa tries to explain, Chitose shoves him into a black car that then drives away.