Shoumetsu Toshi is an anime series based on a popular mobile game. The story follows a mysterious event that causes a city to vanish, leaving only one survivor. Takuya, a professional courier, and Yuki, the lone survivor, team up to uncover the truth behind the disappearance. As they navigate through various challenges, they encounter unexpected allies and formidable foes. The series combines elements of science fiction and adventure, creating an engaging narrative that explores themes of loss and survival.