Kasumi is a nukenin ("missing shinobi") and former member of the Mugen Tenshin clan. 

She is second-in-line for the title of clan master within the Mugen Tenshin and Hayate's younger sister. She is also the half-sister and cousin of Ayane, as well as Honoka's cousin.

A Dead or Alive Xtreme manga was released in Japan. This black and white manga takes place in the Dead or Alive universe, covering the beach volleyball tournament. All of the girls are present in a large variety of cute swimsuits from the game.


Dead or Alive 2 Comic Anthology is the first installment in the Japan-exclusive Dead or Alive anthology comic series published by DNA Media Comics. The comic is a series of short stories featuring the cast of Dead or Alive 2, each illustrated by different manga artists. 
 
(Source: Dead or Alive Wiki)

Japan-exclusive gag comic in the Gamest Comics series, dedicated to Dead or Alive. The comic is a series of one-off short gags featuring the cast of the arcade version of the first game, each illustrated by different manga artists. 
 
(Source: Dead or Alive Wiki)

Short 4-panel manga stories centering around the cast of the Dead or Alive 3 videogame.

Short 4-panel manga stories centering around the cast of the Dead or Alive 4 videogame.

Assorted commercials for the Azur Lane Mobile Game posted on the official Youtube channel. The animation is unique to these commercials and is not present in the game nor in the TV Series.
 
The list of the commercials is as follows (note that CMs without animation are not present and, for the ones with long and short versions, the longer version is taken into consideration):
 
1) 縹映る深緋の残響篇 (17 April 2020) 
2) 神穹を衝く聖歌 (19 May 2020) 
3) 極夜照らす幻光 (23 July 2020) 
4) アズールレーン 25時間生放送アニメ制作マラソンPV (13 September 2020) 
5) 激唱のユニバース (28 October 2020) 
6) 「アズールレーン」×「DEAD OR ALIVE Xtreme Venus Vacation」コラボ (18 November 2020) 
7) 虚畳なりし限象 (21 December 2020) 
8) 暁射す氷華の嵐 (21 February 2021) 
9) 讃える復興の迷路 (19 April 2021) 
10) ニュージャージー (23 May 2021) 
11) 「アズールレーン」×「THE IDOLM@STER」コラボ (26 July 2021) 
12) 島風 (14 September 2021) 
13) 「アズールレーン | SSSS.GRIDMAN / SSSS.DYNAZENON」コラボ (20 November 2021) 
14) 遡望せし虹彩の塔 (30 December 2021) 
15) 鳴動せし星霜の淵 (18 February 2022) 
16) 誠閃の剣　搖光の城 (22 May 2022) 
17) 赫の涙月　菫の暁風 (12 September 2022) 
18) 「アズールレーン」×「ライザのアトリエ２」「ライザのアトリエ３」コラボ (18 November 2022) 
19) 積重なる事象の幻界 (16 December 2022) 
20) 黙示の遺構 (20 February 2023) 
21) 覆天せし万象の塵 (19 May 2023) 
22) 愚者の天秤 (13 August 2023) 
23) 須臾望月抄 (13 September 2023) 
24) 「アズールレーン」×「シノビマスター 閃乱カグラ NEW LINK」 (11 November 2023) 
25) 光追う星の海 (15 December 2023) 
26) 銀界遊廻 (23 February 2024) 
27) 共鳴のパッション (19 April 2024) 
28) 赫輝のマルティリウム (17 May 2024) 
29) トキメク休日大航海 (22 May 2024) 
30) カウガール着せ替えシリーズ2024編 (11 August 2024) 
31) 絳染む丹華の詠歌 (7 September 2024) 
32) 周年着せ替えシリーズ第一弾 (12 September 2024) 
33) 星降る夕影の残光 (16 December 2024) 
34) 冬の着せ替え第2弾 (26 December 2024) 
35) 春節着せ替えシリーズ2025 (20 January 2025) 
36) 籠檻に囚われし神光 (23 February 2025) 
37) 2025年2月着せ替えシリーズ (25 February 2025)