Jikuu no Cross Road Picnic wa Shumatsu ni

is the first 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 September 2000.

Synopsis
"Even so, it's peaceful." Kosui Kinashi, a high school student in Tomiko City, was surrounded by friends who couldn't help but spent ordinary but peaceful days. One day, "You seem to have talent", he meets a mysterious old man and is handed a space-time transfer device. When he turned on the switch, he arrived at Tomiko City, which collapsed, "This world is hell ...". And friends who desperately survived in difficult situations were waiting for him. "I'm glad ... I was alive ..." Kaori, a childhood friend who is pleased with her survival. However, Kosui couldn't hide his confusion. "This is not my world ..."

(source: Bookwalker JP - Translated)