Midori no kjófu (E02)

On TDF Agent Ishiguro's return from space, his wife and maid discover a rock on their driveway. The Ultra Guard recognizes the alien substance as Tilsonite 808, but it's left to the police. Later, a second piece of Tilsonite 808 mutates Ishiguro into a plant-like alien, Waiell, assaulting and nearly killing someone. When the Ultra Guard retrieves him, the man also turns into a creature. (Prime Video)