Invaders from the Crimson Realm have descended upon Earth looking for something called the Power of Existence. Whoever possesses this power will control the very... more>> fabric of existence. To the rescue comes an otherworldly young girl with fire in her eyes. She may be cute and petite, but she's endowed with enough preternatural strength to save the entire universe. Plus, she's got a really big sword! <<less

A collection of side stories included with the blu-ray limited editions of the K - Return of Kings anime.... more>>

- BD1 「潜伏と再開」 (On Lying in Hiding and Reunions) by Miyazawa Tatsuki
- BD2 「剣、二振り」 (Swords in a Pair) by Suzuki Suzu
- BD3 「テンペルホーフ１９４５」 (Tempelhof 1945) by Takahashi Yashichirou
- BD4 「クリスマス・キャロル」 (Christmas Carol) by Furuhashi Hideyuki
- BD5 「昴／長男と、その親友」 (The Pleiades & The Eldest Son and His Best Friend) by Kabei Yukako
- BD6 「デスパレート・ゲーム」 (A Desperate Game) by Raikaku Rei
- BD7 「ある少年の進路探し」 (A Certain Boy’s Search for his Future Path) by Azano Kouhei <<less

A collection of 4 chapters set before the K - Return of Kings anime.... more>>

– 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 「”JUNGLE”」 (“Jungle”) by Takahashi Yashichirou

– Red chapter 「呼び名のその後」 (Aftermath of the Nickname) by Suzuki Suzu <<less

A collection of seven stories about various K characters.... more>>

- No.1 Yatogami Kuroh by Miyazawa Tatsuki
- No.2 Kusanagi Izumo by Azano Kouhei
- No.3 Yata Misaki by Takahashi Yashichirou
- No.4 Kushina Anna by Raikaku Rei
- No.5 Kamamoto Rikio by Suzuki Suzu
- No.6 Awashima Seri by Furuhashi Hideyuki
- No.7 Fushimi Saruhiko by Kabei Yukako <<less

- 「スウィート・バレンタイ」 (Sweet Valentine) by Furuhashi Hideyuki
- 「おひなさまの着物」 (A Doll’s Kimono) by Raikaku Rei
- 「お花見」 (Flower Gazing) by Suzuki Suzu
- 「砂のお城」 (Sand... more>> Castle) by Kabei Yukako
- 「もしかしたらあったかもしれないハロウインナイト」 (A Halloween That Might Have Happened) by Miyazawa Tatsuki
- 「クリスマス１９４４」 (Christmas 1944) by Takahashi Yashichirou
- 「初詣」 (The First Shrine Visit of New Year) by Azano Kouhei <<less