One day, Ooki Taiju was finally prepared to declare his love to his crush, Yuzuriha, and when he was finally about to do so... the world ends, with everyone petrified by an unknown cause. During thousands of years, Taiju holds to his determination while being trapped in stone, thinking about Yuzuriha.
October 5th, 5738 AD. Taiju awakes and gets out of the stone. He finds that his friend, Senkuu, also survived, and they decide they are going to rebuild civilization from zero together.