In the year 2022, where drones fill the skies of Tokyo on a daily basis... One day, Yuiki Yasaki (Mori), a senior appraiser at a real estate company, and his subordinate Kobayashi visit an apartment they have acquired for inspection. Just as they finish their business and are about to return to the office, the two are enveloped in a blinding white light. 'An accident involving a drone suspected of carrying biological weapons' - until decontamination is complete, they find themselves taking refuge in the underground third-floor shelter. Alone together in time and space... And then...
