Joubutsu suru ni wa Mada Hayai!

A year after an unknown virus wiped out humanity, three high school girls—Harumi Koharu, Tsukishima Natsuki, and Akechi Chiaki—spend their time at school playing games they could not have experienced in their lifetimes. Koharu discovers a butterfly with a plant sprouting from a flower bud, and notices that other animals, such as dogs and cats, are also growing plants. The trio begins to wonder what changes have occurred on Earth following the virus's spread.