A meteor heading toward Earth will bring the end of the world in 10 days. This devastating news has caused people to resort to panic and violence. However, others have gradually accepted the impending doom and have decided to await their demise with dignity. Life has never pampered Masumi Nishina, and the end of the world barely upsets him. To have his final days pass quicker, Nishina visits his old university's library; but instead of finding peace, he runs into Ritsu Kusakabe—the single worst person to have ever entered his life.

During their brief affair in college, Ritsu betrayed Nishina and shattered his heart. Ritsu always did whatever he pleased, and now he wishes to spend the rest of his life with Nishina. Although Nishina is hesitant to be anywhere near this wicked man, there is truly not much else to do. So when Ritsu asks Nishina for a favor, it takes them on one final trip across the country before everything falls into darkness.