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Kurosaki Koyuki

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“Ha ha ha...! Great power...! What? Great responsibility? What is that?”

~ Kurosaki Koyuki, to Sensei

Kurosaki Koyuki (黒崎コユキ) is one of the students studying at Millennium Science School who wields a machine gun.

She is a member of Seminar.

Profile[]

Introduction[]

Koyuki is a troublemaker who has returned to Millennium's student council Seminar. She has a natural talent for deciphering mathematical codes, but she seems to be completely unaware of it...

A prodigious cryptanalyst who can crack even the toughest digital encryption systems through nothing more than her intuition. Due to the frequency of her encounters with C&C and her general harmlessness, Koyuki is somewhat on friendly terms with C&C and even calls the members of C&C "Senpai." Her nickname is "White Rabbit."

Personality[]

Arguably the most irresponsible known student in Kivotos. She seemingly never acknowledges her mistakes and almost always considers what she's doing to be right. This nature of hers causes numerous major problems for Millennium. She also often sticks her nose in other people's business, uncovering others' secrets without their permission simply for fun. Althrough, Koyuki expressed guilt and embarrassment when she discovered numerous adult magazines that were confiscated from other students.

Appearance[]

Koyuki has pink hair that's tied off into twintails. Her eyes are magenta with a large yellow sparkle. During her initial debut in Bunny Chaser on Board, Koyuki has pink and yellow hair that's tied off into low twintails and two buns.

Halo[]

Koyuki's halo is a pink circle with two spikes at opposite ends. In the center is a six-tooth cog.

Uniform[]

During the events of Bunny Chaser on Board, Koyuki wears a white tailcoat, a black leotard, a Millennium access badge, white tights, and black high heels. The inner side of her tailcoat is black with a pattern of yellow crosses. Around her neck is a detached collar and the standard Millennium necktie.

She wears white half-palm gloves and carries a white and black top hat that is yellow inside, though she does not wear. Instead, she wears a pair of black and yellow rabbit ears, completing her playboy bunny look.

Firearm[]

She uses a pink (formerly yellow or golden) M60E6 general-purpose machine gun with a black barrel and gas tube. An ammunition counter is present on the "drum" magazine. The Millennium insignia is imprinted on the stock and the magazine.

Combat[]

Skills[]

V • T • E Tricky Variables Cost:4
  • LV01 ~ Deals DMG by throwing 1 random bomb at enemies within a round-shaped area.
    Bullet: Deals 233% of ATK as DMG.
    Electric Field: Deals 221% of ATK as DMG.
    Flame: Deals 209% of ATK as DMG.
  • LV02 ~ Deals DMG by throwing 1 random bomb at enemies within a round-shaped area.
    Bullet: Deals 268% of ATK as DMG.
    Electric Field: Deals 255% of ATK as DMG.
    Flame: Deals 241% of ATK as DMG.
  • LV03 ~ Deals DMG by throwing 1 random bomb at enemies within a round-shaped area.
    Bullet: Deals 339% of ATK as DMG.
    Electric Field: Deals 321% of ATK as DMG.
    Flame: Deals 304% of ATK as DMG.
  • LV04 ~ Deals DMG by throwing 1 random bomb at enemies within a round-shaped area.
    Bullet: Deals 374% of ATK as DMG.
    Electric Field: Deals 354% of ATK as DMG.
    Flame: Deals 335% of ATK as DMG.
  • LV05 ~ Deals DMG by throwing 1 random bomb at enemies within a round-shaped area.
    Bullet: Deals 444% of ATK as DMG.
    Electric Field: Deals 421% of ATK as DMG.
    Flame: Deals 398% of ATK as DMG.

V • T • E Did You Think You Were Alone? Skill Icons
  • LV01 ~ Deals 202% of ATK as DMG to 1 target and up to 2 additional nearby enemies every 30 sec. Reload instantly.
  • LV02 ~ Deals 212% of ATK as DMG to 1 target and up to 2 additional nearby enemies every 30 sec. Reload instantly.
  • LV03 ~ Deals 223% of ATK as DMG to 1 target and up to 2 additional nearby enemies every 30 sec. Reload instantly.
  • LV04 ~ Deals 263% of ATK as DMG to 1 target and up to 2 additional nearby enemies every 30 sec. Reload instantly.
  • LV05 ~ Deals 273% of ATK as DMG to 1 target and up to 2 additional nearby enemies every 30 sec. Reload instantly.
  • LV06 ~ Deals 283% of ATK as DMG to 1 target and up to 2 additional nearby enemies every 30 sec. Reload instantly.
  • LV07 ~ Deals 324% of ATK as DMG to 1 target and up to 2 additional nearby enemies every 30 sec. Reload instantly.
  • LV08 ~ Deals 334% of ATK as DMG to 1 target and up to 2 additional nearby enemies every 30 sec. Reload instantly.
  • LV09 ~ Deals 344% of ATK as DMG to 1 target and up to 2 additional nearby enemies every 30 sec. Reload instantly.
  • LV10 ~ Deals 385% of ATK as DMG to 1 target and up to 2 additional nearby enemies every 30 sec. Reload instantly.

V • T • E Do You Believe In Miracles? Skill Icons
  • LV01 ~ Increases ATK by 14%.
  • LV02 ~ Increases ATK by 14.7%.
  • LV03 ~ Increases ATK by 15.4%.
  • LV04 ~ Increases ATK by 18.2%.
  • LV05 ~ Increases ATK by 18.9%.
  • LV06 ~ Increases ATK by 19.6%.
  • LV07 ~ Increases ATK by 22.4%.
  • LV08 ~ Increases ATK by 23.1%.
  • LV09 ~ Increases ATK by 23.8%.
  • LV10 ~ Increases ATK by 26.6%.

V • T • E Chaos Theory Skill Icons
  • LV01 ~ Increases ATK based on the grenade thrown when using EX-Skills (40 sec).
    Bullet: Increases ATK by 15.3%.
    Electric Field: Increases ATK by 14.5%.
    Flame: Increases ATK by 13.7%.
  • LV02 ~ Increases ATK based on the grenade thrown when using EX-Skills (40 sec).
    Bullet: Increases ATK by 16.1%.
    Electric Field: Increases ATK by 15.2%.
    Flame: Increases ATK by 14.4%.
  • LV03 ~ Increases ATK based on the grenade thrown when using EX-Skills (40 sec).
    Bullet: Increases ATK by 16.8%.
    Electric Field: Increases ATK by 15.9%.
    Flame: Increases ATK by 15%.
  • LV04 ~ Increases ATK based on the grenade thrown when using EX-Skills (40 sec).
    Bullet: Increases ATK by 19.9%.
    Electric Field: Increases ATK by 18.8%.
    Flame: Increases ATK by 17.8%.
  • LV05 ~ Increases ATK based on the grenade thrown when using EX-Skills (40 sec).
    Bullet: Increases ATK by 20.6%.
    Electric Field: Increases ATK by 19.6%.
    Flame: Increases ATK by 18.5%.
  • LV06 ~ Increases ATK based on the grenade thrown when using EX-Skills (40 sec).
    Bullet: Increases ATK by 21.4%.
    Electric Field: Increases ATK by 20.3%.
    Flame: Increases ATK by 19.2%.
  • LV07 ~ Increases ATK based on the grenade thrown when using EX-Skills (40 sec).
    Bullet: Increases ATK by 24.5%.
    Electric Field: Increases ATK by 23.2%.
    Flame: Increases ATK by 21.9%.
  • LV08 ~ Increases ATK based on the grenade thrown when using EX-Skills (40 sec).
    Bullet: Increases ATK by 25.2%.
    Electric Field: Increases ATK by 23.9%.
    Flame: Increases ATK by 22.6%.
  • LV09 ~ Increases ATK based on the grenade thrown when using EX-Skills (40 sec).
    Bullet: Increases ATK by 26%.
    Electric Field: Increases ATK by 24.6%.
    Flame: Increases ATK by 23.3%.
  • LV10 ~ Increases ATK based on the grenade thrown when using EX-Skills (40 sec).
    Bullet: Increases ATK by 29.1%.
    Electric Field: Increases ATK by 27.5%.
    Flame: Increases ATK by 26%.


V • T • E Skill Status (Hover Over) Status Effect
EX-Skill Normal Passive Sub UE

⁠

Attack Up
Buff
Increase attack damage

⁠

Attack Up
Buff
Increase attack damage

⁠

Attack Up
Buff
Increase attack damage

Growth Material[]

EX-SkillV • T • EGrowth Material
LV02
x12
x12
x80K
LV03
x12
x18
x13
x31
x500K
LV04
x12
x18
x11
x24
x3M
LV05
x8
x18
x6
x20
x10M

Other-Skills (Normal / Passive / Sub)V • T • EGrowth Material
LV02
x5
x5000
LV03
x8
x7500
LV04
x5
x12
x4
x60K
LV05
x8
x4
x14
x90K
LV06
x5
x12
x10
x18
x300K
LV07
x8
x3
x14
x450K
LV08
x8
x12
x4
x8
x1.5M
LV09
x12
x8
x14
x2.4M
LV10
x1
x4M

Unique Equipment[]

V • T • E Mulli・Gun (マリ・ガン) Firearm
⁠ A machine gun that has overcome all kinds of hardships together with Koyuki.
It changed its color when it was sent for repair once. It is a sturdy gun, just like Koyuki, who does not care about trivial things.

V • T • E Limit Break Firearm
⁠ ⁠⁠ Passive skill enhanced to "Do You Believe In Miracles?+"
⁠⁠⁠ ⁠ enhancement to ⁠
⁠⁠⁠⁠ Increases Mystic Effectiveness by 10%
⁠⁠⁠⁠⁠

V • T • E Stats Firearm
⁠ LV01 LV30 LV40 LV50 LV60 LV70
ATK 153 555 693 832 970 1109
HP 537 1952 2440 2927 3415 3903

V • T • E Do You Believe In Miracles?+ Firearm
⁠
  • LV01 ~ Increases ATK by 417. Also increases ATK by 14%.
  • LV02 ~ Increases ATK by 438. Also increases ATK by 14.7%.
  • LV03 ~ Increases ATK by 459. Also increases ATK by 15.4%.
  • LV04 ~ Increases ATK by 542. Also increases ATK by 18.2%.
  • LV05 ~ Increases ATK by 563. Also increases ATK by 18.9%.
  • LV06 ~ Increases ATK by 583. Also increases ATK by 19.6%.
  • LV07 ~ Increases ATK by 667. Also increases ATK by 22.4%.
  • LV08 ~ Increases ATK by 688. Also increases ATK by 23.1%.
  • LV09 ~ Increases ATK by 708. Also increases ATK by 23.8%.
  • LV10 ~ Increases ATK by 792. Also increases ATK by 26.6%.

Unique Item[]

Kurosaki Koyuki does not have Unique Item.

Bond[]

V • T • EAffection Rank BonusAffection
Cotton Candy Island
Memorial Lobby⁠⁠Total Stats ~ ATK+227 / HP+1005

LV02-05ATK+3
LV06-10ATK+5
LV11-15ATK+7 / HP+47
LV16-20ATK+9 / HP+56
LV21-30ATK+2 / HP+10
LV31-40ATK+3 / HP+15
LV41-50ATK+6 / HP+24

Poll[]

https://bluearchive.fandom.com/f/p/4400000000000035241

Trivia[]

  • Koyuki is the first character to be introduced that isn't wearing her uniform until the "Final Chapter".
  • She is the first character with an EX Skill that involves an RNG mechanic that is not Crit.
    • Her EX Skill may be inspired by the Variable Grenade from Call of Duty: Advanced Warfare. The different but unique features of each of them are that CoD:AW's Variable Grenade can track and fly to a target before exploding, explode when hitting any surface, and stun enemies with a bright red light to detect them or just a blinding flash, while Koyuki's grenade can fire bullets in fully automatic. The similar features of both of them are that they can explode with a delay, and create an electrical/EMP field after exploding.
  • Koyuki's birthday is on Valentine's Day.
  • In her initial debut, she was kicked out from Seminar and as a result was treated as a fugitive. She returned to the Seminar fold by the time of Volume F.
  • In August 31st, 2025, a hacking incident affected the game's Global servers, which lead to an emergency maintenance period shortly afterwards. Before the server went down, players were welcomed and surprised with a "Koyukification" of the game, comprised of the following events:
    • The thumbnail of both Event and Recruitment banners being replaced with the face of Koyuki's 3D model covering that corner of the screen.
    • The information page being altered, with its title replaced with a "nihahaha", and the fan-made website known as "Koyuki clicker", a page that includes her Live2D Recollection Lobby image along with Koyuki's signature laugh playing every time the screen was clicked/tapped.
    • The Cafe's Visitors being all replaced with more than one Koyuki apearing in both of the floors. Later, the cafe is filled with all students and their variants. After that, the cafe is filled with Hatsune Miku instead.
    • This incident resulted in many fan-art and memes spreading out in the community.
    • The above text about the incident is pure speculation of course, because any sane Sensei would know that nothing happened on 8/31/25.

Navigation[]

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⁠ ⁠⁠⁠⁠
V • T • E Student by Clubs
Abydos High School
Countermeasures Committee Hoshino • Shiroko • Shiroko Terror • Serika • Ayane • Nonomi
Event Variant Hoshino (Swimsuit) • Hoshino (Armed) • Shiroko (Riding) • Shiroko (Swimsuit) • Serika (New Year) • Serika (Swimsuit) • Ayane (Swimsuit) • Nonomi (Swimsuit)
Gehenna Academy
Pandemonium Society Makoto • Iroha • Ibuki • Satsuki • Chiaki
Disciplinary Committee Hina • Ako • Iori • Chinatsu
Handyman 68 Aru • Mutsuki • Kayoko • Haruka
Gourmet Research Society Haruna • Junko • Izumi • Akari
School Lunch Club Fuuka • Juri
Emergency Medicine Club Sena
Hot Spring Department Kasumi • Megu
Sparkle Club Kirara
Event Variant Hina (Swimsuit) • Hina (Dress) • Ako (Dress) • Iori (Swimsuit) • Chinatsu (Hot Spring) • Aru (New Year) • Aru (Dress) • Mutsuki (New Year) • Kayoko (New Year) • Kayoko (Dress) • Haruka (New Year) • Haruna (New Year) • Haruna (Gym) • Junko (New Year) • Izumi (Swimsuit) • Izumi (New Year) • Akari (New Year) • Fuuka (New Year) • Juri (Part Timer) • Sena (Casual)
Millennium Science School
Seminar Rio • Yuuka • Noa • Koyuki
Veritas Chihiro • Maki • Hare • Kotama
Cleaning&Clearing Neru • Asuna • Karin • Akane • Toki
Engineering Department Utaha • Hibiki • Kotori
Gym Training Department Sumire • Rei
Paranormal Affairs Dept Himari • Eimi
Game Development Dept Yuzu • Midori • Momoi • Alice
Event Variant Yuuka (Gym) • Yuuka (Pajamas) • Noa (Pajamas) • Maki (Camp) • Hare (Camp) • Kotama (Camp) • Neru (Bunny Girl) • Neru (Schoolgirl) • Asuna (Bunny Girl) • Asuna (Schoolgirl) • Karin (Bunny Girl) • Karin (Schoolgirl) • Akane (Bunny Girl) • Toki (Bunny Girl) • Utaha (Cheerleader) • Hibiki (Cheerleader) • Kotori (Cheerleader) • Sumire (Part Timer) • Eimi (Swimsuit) • Yuzu (Maid) • Midori (Maid) • Momoi (Maid) • Alice (Maid)
Trinity General School
Tea Party Nagisa • Seia • Mika
After-School Sweet Club Yoshimi • Natsu • Airi • Kazusa
Justice Realization Committee Tsurugi • Hasumi • Mashiro • Ichika
Knight Hospitaller Mine • Hanae • Serina
Supplementary Lesson Dept Hifumi • Azusa • Koharu • Hanako
Trinity Vigilante Reisa • Suzumi
Library Committee Ui • Shimiko
Sisterhood Sakurako • Mari • Hinata
Other Rabu
Event Variant Nagisa (Swimsuit) • Seia (Swimsuit) • Mika (Swimsuit) • Kazusa (Band) • Airi (Band) • Yoshimi (Band) • Natsu (Band) • Tsurugi (Swimsuit) • Hasumi (Gym) • Hasumi (Swimsuit) • Ichika (Swimsuit) • Mashiro (Swimsuit) • Mine (Idol) • Hanae (Christmas) • Serina (Christmas) • Hifumi (Swimsuit) • Azusa (Swimsuit) • Koharu (Swimsuit) • Hanako (Swimsuit) • Reisa (Magical) • Suzumi (Magical) • Ui (Swimsuit) • Sakurako (Idol) • Mari (Gym) • Mari (Idol) • Hinata (Swimsuit)
Hyakkiyako Alliance Academy
Yin-Yang Club Niya • Kaho • Chise
Hyakkaryouran Nagusa • Renge • Kikyou • Yukari
Festival Mgt Committee Shizuko • Pina • Umika
Etiquette Training Society Tsubaki • Mimori • Kaede
Ninjutsu Research Dept Michiru • Izuna • Tsukuyo
Other Wakamo
Event Variant Chise (Swimsuit) • Renge (Swimsuit) • Kikyou (Swimsuit) • Yukari (Swimsuit) • Shizuko (Swimsuit) • Pina (Guide) • Tsubaki (Guide) • Mimori (Swimsuit) • Izuna (Swimsuit) • Wakamo (Swimsuit)
Shanhaijing Senior Secondary School
Xuanlong Office Kisaki • Mina
Training Support Dept Shun • Kokona
Chinese Alchemy Study Club Saya
Xuanwu Merchant Association Rumi • Reijo
Event Variant Shun (Young) • Saya (Casual)
Red Winter Federal Academy
Red Winter Office Cherino • Tomoe • Marina
Public Workers Department Minori
Knowledge Liberation Front Meru • Momiji
No. 227 Special Class Nodoka • Shigure
Event Variant Cherino (Hot Spring) • Tomoe (Qipao) • Marina (Qipao) • Nodoka (Hot Spring) • Shigure (Hot Spring)
Valkyrie Police Academy
Public Safety Bureau Kanna
Life Safety Bureau Kirino • Fubuki
Event Variant Kanna (Swimsuit) • Kirino (Swimsuit) • Fubuki (Swimsuit)
SRT Special Academy
RABBIT Platoon Miyako • Saki • Moe • Miyu
Event Variant Miyako (Swimsuit) • Saki (Swimsuit) • Moe (Swimsuit) • Miyu (Swimsuit)
Arius Branch School
Arius Squad Saori • Atsuko • Misaki • Hiyori
Nicomedia Troop Subaru
Event Variant Saori (Swimsuit) • Saori (Dress) • Atsuko (Swimsuit) • Misaki (Swimsuit) • Hiyori (Swimsuit)
Highlander Railroad Academy
Central Control Center Hikari • Nozomi
Freight Transport Management Department Aoba
Wild Hunt Academy of Arts
Occult Research Society Eri • Kanoe
Free Trade Cartel Miyo • Ritsu • Fuyu
Others
Collaboration Hatsune Miku • Misaka Mikoto • Shokuhou Misaki • Saten Ruiko


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