Shin Jikuu no Cross Road Midori no Yuubi no Onnanoko

is the fourth volume of the Jikuu no Cross Road light novel series, written by Kazuyuki Takami and Illustrated by Anmitsu Sou. It was released under the Dengeki Bunko Imprint in April 2002.

Synopsis
"'Green fingers' are old European proverbs that have a special talent for growing plants." Mizuho Kaminaga, a girl who can interact with plants. Mizuho and her childhood friend Masayuki meet a beautiful woman, Chinatsu, on her way to high school. Since Chinatsu and Mizuho's hobbies were gardening, the three became close to each other. "I want you to grow this." One day, Chinatsu gives Mizuho her wheat fruit. Chinatsu's true identity-She was a resident of another world who came with a space-time transporter. A world where humankind is on the verge of extinction due to global warming and poisoning of plants-80 years from now. The wheat that Chinatsu developed was the last hope of humankind to suffer from food shortages ...

(source: Bookwalker JP - Translated)