Expelled from Paradise –The Stellar Angel–

A.D. 2400. Ever since the Nano Hazard, a catastrophic event that laid waste to the surface world, 98% of humanity has abandoned both the ravaged Earth and their own flesh and blood to migrate to the virtual world of DEVA. Now, a strange new lifeform has suddenly begun sprouting on the surface: the Paraflora. As it spreads at alarming speed, colossal worms have started to appear nearby, attacking people one after another. At the heart of the outbreak lies Svarga, a desert town that was long ago abandoned due to a plague. Meanwhile, an agent of DEVA’s Security Bureau has stolen Grey Goo, a top-secret file holding data on the Nano Hazard, and fled to the surface. Their trail, too, leads to Svarga. And now, in this ghost town shrouded in mystery and conspiracy, several competing agendas are about to converge.

[From Steam]