The Unexplored Summon:// blood-sign (4)

is the fourth volume of the The Unexplored Summon:// blood-sign light novel series, written by Kazuma Kamachi and Illustrated by Waki Ikawa. It was released under the Dengeki Bunko Imprint in January 2016.

Synopsis
What was waiting for Kyosuke was "White Queen" in the super sweet lover mode. Is it the secret swimsuit time or the worst war start? When Kyosuke Shiroyama woke up in the morning, that worst unexplored "White Queen" was cooking homemade food in perfect new wife mode. In the first place, it seems that they were sleeping together on Kyosuke's arm pillow. ...... Don't despair. The world isn't over yet. Kyosuke, the strongest summoner, organizes the situation in which he is placed while holding the queen who is spoiled. "Pandemonium" -The world's largest "box" that has achieved a summoning method to replace the blood sign type, and the "brain" built into a mobile fortress that weaponizes deities and even unexplored classes To save ... That was the "request" to him. No, but something is wrong. There is no Yorishiro who should be the client. On the contrary, his own memory until he wakes up in the morning has disappeared ... Kyosuke has no choice but to fight with the "White Queen" and challenge the mysterious fortress--!

(source: Dengeki Bunko Official Website - Translated)