Seventh Heaven (4) Kiri no Furu Jidai

is the fourth volume of the Seventh Heaven light novel series, written by Hiroyuki Domon and Illustrated by Fujimoto Hideaki. It was released under the Dengeki Bunko Imprint in August 1999.

Synopsis
Mankind has lost big cities around the world due to the "Great Advent". Behind the incident was the former "First Person (Breammu)" -Tatsuya Jobanzu. Mio and his friends fighting against Jobanzu's subordinates fall into a crisis before their overwhelming power. At that time, the voice of the magical beast Diguamide echoed. -Do you want my strength? Mio and Mio, who have awakened the power of the "Sacred Land" as Christmas gifts, are fulfilling ... !! Meanwhile, Tig, who has left the party, heads to Africa to retrain his ability as a warrior. He met there ... The latest issue of the super popular series is finally here.

(source: Amazon JP - Translated)