In the year 2115, the island nation formerly known as Japan has been rebranded as the “17th Far East Imperial City Management District.” Its citizens were assured a peaceful existence, albeit at the cost of some of their previous comforts. They lived under the assumption that their lives would remain unchanged, with each day mirroring the last. However, they were unaware of the looming catastrophe threatening their society. A rare affliction called “Degradation,” which causes the human body to disintegrate into sand, was gradually spreading across the globe. Tohru Kazasumi, an average student, finds himself caught in an interdimensional conflict between his world and a parallel realm known as “Frontier S (Stratos).” This conflict forces Tohru to confront an alternate version of himself. As their destinies intertwine, the question remains: can peace be achieved between the two worlds?