A huge meteorite falls to the earth. There are only 10 days left until the earth's destruction.
Masumi Nishina, an office worker with nothing to live for, visits the university library of his alma mater to spend his remaining time quietly. There, he runs into Ritsu Kusakabe, a man who once hurt him deeply. Masumi gradually became attracted to Ritsu, who had belonged to the same club in college, and they developed a special relationship, but the sexually unrestrained Ritsu betrayed her and left her. Since then, Ritsu was a man that Masumi never wanted to see again, but...

But when Masumi rejects Ritsu's proposal to stay with him until his last day on earth, she walks away. Ritsu shows Masumi a medicine that allows her to die easily just by taking it.
Ritsu "I'll give it to you, but I need your help.
Masumi "What?"
Ritsu "dispose of the corpse."

From the sweet night Masumi and Ritsu spent as students to the last day of the earth's destruction when the sun will never rise again. What will happen to the two of them, and to the world? This is a frustrating and endearing, heart-pounding and heart-throbbing, doomsday boys' love story.

巨大隕石が地球に落下する。地球滅亡まで、あと10日。
生きがいのない日々を送っていたサラリーマンの仁科真澄は、残された時間を静かに過ごそうと、母校の大学図書館を訪れる。そこで偶然再会したのは、かつて自分を深く傷つけた男・日下部律だった。真澄は大学時代同じサークルに所属していた律に次第に惹かれていき、特別な関係へと発展していったが、性に奔放な律に裏切られ捨てられてしまう。それ以来、真澄にとって律は二度と会いたくない男だった、はずだが――。

「地球最後の日まで一緒にいない？」という提案を拒絶し立ち去ろうとする真澄に、律は「飲むだけで楽に死ねる薬」を見せる。
律「それあげるから、手伝って欲しいんだよね」
真澄「何を？」
律「死体の処理」

真澄と律が過ごした学生時代の甘い夜から、二度と太陽が昇らない地球滅亡の最期の日まで。果たして2人は、世界は、どうなってしまうのか。もどかしくて愛おしい、ドキドキとズキズキが交錯する、終末ボーイズラブストーリー。