The Unexplored Summon://Blood Sign

The Unexplored Summon://Blood-Sign (未踏召喚://ブラッドサイン) is a light novel series authored by Kamachi Kazuma and illustrated by Ikawa Waki, published by ASCII Media Works under the Dengeki Bunko imprint. The Unexplored Summon://Blood-Sign revolves around Shiroyama Kyousuke who is the cutting-edge summoners. The series is currently complete at 10 volumes.

It has been featured in the Toaru Majutsu no Index light novels as they share the same author and publisher.

Synopsis
Summoning ceremonies can freely call forth even "those which lurk in the depths beyond the gods". One boy has top-level abilities even among the cutting-edge summoners who can use those ceremonies.

He is Alice (with) Rabbit aka Shiroyama Kyousuke.

But this strongest summoner has a single fatal weakness.

A certain "cursed words" spoken by girls: "Help me."

When Kyousuke hears those words from Meinokawa Higan, a girl brought to the verge of death, he throws himself into a city where three great summoner forces clash!

Principal Characters

 * Shiroyama Kyousuke (城山恭介) – Ace summoner of talent from one of the three main summoner factions, Freedom.
 * The White Queen (白き女王) – The strongest Unexplored-class Material.

World Rejecter Arc
The first volume of The Unexplored Summon://Blood-Sign cover along with the first volume of Heavy Object cover are featured in color illustration.

Processor Suit Arc
When Hamazura uses the payphone, the screen displays a deformed pixel art Brother Santa being chased by Queen Reindeer near the paid amount and being caught when it runs out, a reference to The Unexplored Summon://Blood-Sign.