Centers on two people who work at a travel agency in Tokyo: Rika and Takuya. Both are loners who enjoy their current lifestyles. Takuya gushes over his cat and Rika is obsessed with maps and is bad at socializing. Suddenly their travel agency announces it is opening a branch in Siberia, and plans to send some unmarried people to staff the office. Rika and Takuya, in order to protect their current lifestyles and not be sent to Siberia, decide to have a fake marriage. The two have hardly even spoken to each other before. Their wedding is in 365 days.