Short story collection by Azano complementary to his R:B novel and its movie adaptation. Consisted of 24 parts called "Piece"

Set in the original universe of K, this collection of short stories follows one clan for each short story.

A novel adaptation of K, focused on the history of the blue clan and the events which led to Munakata Reisi's appointment as the current blue king.

A collection of 4 chapters set before the K – Return of Kings anime. – Blue chapter 「眼鏡屋別サイド」 (Optician's, Another Side) by Miyazawa Tatsuki – Silver chapter 「お風呂ネコトラブル」 (Neko Bathtime Trouble) by Raikaku Rei – Green chapter

A collection of short stories set after the K – Return of Kings anime posted on its official website.

A collection of short stories about various K characters.

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Suoh Mikoto, leader of "Homra", was strengthening his clan in Shizume Town. Munakata Reisi, the Blue King just enthroned, immediately reorganized "Scepter 4" and recovered order. When two opposite men meet, the conflict was inevitable!

In Kishimori Naoto's class, many of his classmates see a classroom in their dream. And the one who were eaten by a monster in their dream won't wake up anymore. Together with his cold childhood friend Kuze Ayano they are trying to solve the mystery that l