Shin Jikuu no Cross Road 3 Akai Kokoro no Onnanoko

is the sixth 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 May 2003.

Synopsis
Yuki, a mysterious girl who always takes care of Shinichi when she appears from somewhere. Shinichi just repels her, who smiles, "The person in trouble is not an unrelated person." On the other hand, at the same time, a series of amusing criminal cases occur in the streets. Shinichi gets involved in one of them, but it was Yuki again who saved her. And Shinichi is informed of the astonishing truth. It is said that Yuki has a mission to save this world from ruin. Moreover, it seems that Shinichi holds the key. Shinichi was uncertain about his raison d'etre, but the time to test his courage was imminent.

(source: Bookwalker JP - Translated)