Listen Up! …Fall Asleep and You Die, But Not From the Cold

Kamijou-san, Two Idiots, Jinnai Shinobu, Gray Pig, and Freedom Award 903, Listen Up! …Fall Asleep and You Die, But Not From the Cold☆ (上条さんも馬鹿二人も陣内忍も灰色の豚も『フリーダム』のアワード903も、はい注目！ ……寝たらみんな死ぬぞ、ただし寒さ以外で☆) is a short crossover story written by Kamachi Kazuma on his personal website, detailing the characters of Kamachi Kazuma's various works's attempts in staying up to prevent being captured by the White Queen of The Unexplored Summon://Blood Sign. It was released on September 9th 2016.

It was later released on October 8th 2016 in a limited booklet accompanying the release of the third volume of ''The Weakness of Beatrice the Level Cap Holy Swordswoman That Made Being the Strongest Even More Trouble – His Name? Boo Boo''.

Much of the story is narrated in Beatrice's point-of-view, making her the main protagonist of the story.

Synopsis
The characters from various worlds somehow ended up in Jinnai Shinobu's house, back when he was still a young boy. After making friends with Boo Boo, Shinobu declares that they will have a Sleepless Championship, and that they will all have to stay up as long as they can. The characters have no reason to play along that is until Filinion dozes off, and is grabbed by White Queen into the forbidden room of the Shinobu household, wanting to capture Shiroyama Kyousuke. Knowing of their fates, the characters are forced to play along, and one by one, they either get unlucky or try to take each other out.

Toaru Majutsu no Index

 * Kamijou Touma
 * Index Librorum Prohibitorum
 * Misaka Mikoto

The Weakness of Beatrice the Level Cap Holy Swordswoman That Made Being the Strongest Even More Trouble – His Name? Boo Boo

 * Boo Boo
 * Beatrice
 * Filinion
 * Armelina

The Zashiki Warashi of Intellectual Village

 * Jinnai Shinobu
 * Zashiki-Warashi Yukari
 * Uchimaku Hayabusa

The Unexplored Summon://Blood Sign

 * Shiroyama Kyousuke
 * White Queen
 * Aika Toydream
 * Lu Niang-Lan

Heavy Object

 * Quenser Barbotage
 * Heivia Winchell
 * Milinda Brantini

Other locations

 * Intellectual Village (from The Zashiki Warashi of Intellectual Village)
 * Jinnai Household
 * Ground's Nir ( from The Weakness of the Level-Cap Sword Saint Beatrice Who Aggravated the Strongest: Its Name is "Booboo", referenced)