Tokyo × Isekai Sensou: Jietai, Ikai Seibutsu wo Geigeki Seyo

is a Japanese light novel series written by Washimiya Daijin, with illustrations by daito. The series began publication on May 10, 2019 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Before dawn on September 14th, when the heat is harsh. A large hole with a diameter of over 50 meters was opened overnight in a section of Ariake, Koto-ku, Tokyo. The city is busy responding to the emergence of a bottomless cavity, the media works to edit a news special, and people living nearby are forced to evacuate.

Next day, Self-Defense Forces officer Tamaki Yabuki canceled his promise with his daughter Hanane and visited Kasumigaseki to deal with this abnormal situation. There, he learns that creatures from another world are crawling out of the cave in Ariake and attacking the citizens of Tokyo.

Unfortunately, Hanane should have gone to the big site where the event is being held with a friend.