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Koyuki (Pajamas)

Millennium Science School

Koyuki (Pajamas)

★★★

/Mystic/Support

Btier

Introduction

Koyuki (Pajamas) is a 3-star Mystic student in Blue Archive. Koyuki (Pajamas)'s role is Support. School: Millennium Science School.

On the Blue Archive tier list Koyuki (Pajamas) is B tier, 100th of the 242 students ranked.

Other Mystic students in Blue Archive: Akane (Bunny), Akari (New Year), Ako, Aris, Aris (Armed), Aris (Maid) and 61 more.

What Koyuki (Pajamas) does

Her EX cleanses one debuff from an ally and gives every Striker ally a 30-second Critical Damage buff, which triples if the cleanse actually removed something. Every 40 seconds she fires a cone attack with extra damage against extra-large enemies, and her Sub adds team-wide Attack Speed.

Koyuki (Pajamas) in raids

On the raids usage list Koyuki (Pajamas) is D tier, 148th of 264: brought by 0.6% of ranked Global players to the last 8 raids, on average.

  • Raid usage0.56%

By raid, newest first

  • Hod (Indoor)0.1%
  • Gregorius (Indoor)0%
  • Hovercraft (Outdoor)0.1%
  • Drumbarka (Street)3.8%
  • Myouki Kurokage (Street)0.1%
  • KAITEN FX Mk.0 (Street)0%
  • Perorodzilla (Outdoor)0.3%
  • Goz (Outdoor)0.1%

Koyuki (Pajamas)'s banners

All banners
  • 14 July 2026 to 21 July 2026Pick-Up Recruitment

Profile

Millennium Seminar's genius troublemaker.

She's wearing pajamas that Yuuka gifted her. However, regardless of the outfit, Koyuki is always Koyuki, and her free-spirited attitude is as strong as ever.

Koyuki (Pajamas)'s full name is Kurosaki Koyuki. Koyuki (Pajamas)'s birthday is February 14th, and Koyuki (Pajamas) stands 4'11" tall. Koyuki (Pajamas) is voiced by 乾夏寧 in Japanese and Kim Bona in Korean. Koyuki (Pajamas)'s hobby is testing her luck and escaping. Blanchat drew Koyuki (Pajamas).

Stats

  • Max HP115th26,917
  • ATK135th3,412
  • DEF38th535
  • Healing43rd6,926
  • Accuracy117th691
  • Evasion245th187
  • Crit20th266
  • Crit DMG200%
  • Stability102nd1,504
  • Normal Attack Range1,000
  • Cost Recovery700

At level 90 and 5 stars, before the Exclusive Weapon, equipment, Talents and Relationship Rank. Each bar is measured against the highest value in the Blue Archive roster, and the place is out of every student with that stat.

At level 1 and 90

  • Max HPLevel 1, 3 stars: 3,274Level 90, 3 stars: 22,331Level 90, 5 stars: 26,917
  • ATKLevel 1, 3 stars: 299Level 90, 3 stars: 2,721Level 90, 5 stars: 3,412
  • DEFLevel 1, 3 stars: 97Level 90, 3 stars: 535Level 90, 5 stars: 535
  • HealingLevel 1, 3 stars: 2,013Level 90, 3 stars: 5,632Level 90, 5 stars: 6,926
  • AccuracyLevel 1, 3 stars: 691Level 90, 3 stars: 691Level 90, 5 stars: 691
  • EvasionLevel 1, 3 stars: 187Level 90, 3 stars: 187Level 90, 5 stars: 187
  • CritLevel 1, 3 stars: 266Level 90, 3 stars: 266Level 90, 5 stars: 266
  • Crit ResLevel 1, 3 stars: 100Level 90, 3 stars: 100Level 90, 5 stars: 100
  • Crit DMGLevel 1, 3 stars: 200%Level 90, 3 stars: 200%Level 90, 5 stars: 200%
  • Crit DMG ResLevel 1, 3 stars: 50%Level 90, 3 stars: 50%Level 90, 5 stars: 50%
  • StabilityLevel 1, 3 stars: 1,504Level 90, 3 stars: 1,504Level 90, 5 stars: 1,504
  • Normal Attack RangeLevel 1, 3 stars: 1,000Level 90, 3 stars: 1,000Level 90, 5 stars: 1,000
  • CC PowerLevel 1, 3 stars: 100Level 90, 3 stars: 100Level 90, 5 stars: 100
  • CC ResLevel 1, 3 stars: 100Level 90, 3 stars: 100Level 90, 5 stars: 100
  • Recovery BoostLevel 1, 3 stars: 100%Level 90, 3 stars: 100%Level 90, 5 stars: 100%
  • Cost RecoveryLevel 1, 3 stars: 700Level 90, 3 stars: 700Level 90, 5 stars: 700
  • Mag CountLevel 1, 3 stars: 1Level 90, 3 stars: 1Level 90, 5 stars: 1
  • DEF PenetrationLevel 1, 3 stars: 0Level 90, 3 stars: 0Level 90, 5 stars: 0
  • MobilityLevel 1, 3 stars: 200Level 90, 3 stars: 200Level 90, 5 stars: 200

Before the Exclusive Weapon, equipment, Talents and Relationship Rank. Stars raise ATK, Max HP and Healing only.

Combat profile

Squad
Special (supports from the back line)
Position
Back
Attack type
Mystic
Armor type
Light
Weapon
Machine gun
School
Millennium Science School
Club
Seminar
Year and age
1st Year, 15 years old
Equipment slots
Shoes, Badge, Watch

Terrain affinity

  • UrbanS (SS with the weapon at 3 stars)
  • OutdoorD
  • IndoorB

Affinity sets how well a student fights on each stage type, from D up to SS.

Skills

5

  • I Never Expected This!

    EX Skill · Cost 3
    Level

    Removes 1 debuff from 1 ally. Increases Crit DMG of ally Strikers by 15.4% (for 30 sec). Triples the Crit DMG increase if a debuff is removed.

  • Boom, Bang

    Basic Skill
    Level

    Deals 444% of ATK as damage to enemies within a fan-shaped area every 40 sec. Deals 177% of ATK as additional damage to extra-large enemies.

  • Aesthetics of All-Nighters

    Enhanced Skill
    Level

    Increases ATK by 26.6%.

  • Aesthetics of All-Nighters+

    Enhanced Skill +
    Level

    Increases Crit DMG by 3800. Also increases ATK by 26.6%.

    Replaces Aesthetics of All-Nighters once Koyuki (Pajamas)'s Exclusive Weapon reaches 2 stars.

  • The Pajama Effect

    Sub Skill
    Level

    Increases ally ATK SPD by 17.3%.

Exclusive Weapon

Upgrade planner

Mulli-Gun

Machine gun

Machine gun that's supported Koyuki through thick and thin. Unlike its mischievous owner, it steadfastly supports its owner without comment. ...Or, perhaps, the gun doesn't think much at all.

  • 1 starLv. 30: ATK +392, Max HP +2,313, Healing +732
  • 2 starsLv. 40: ATK +490, Max HP +2,891, Healing +915Enhanced Skill becomes Aesthetics of All-Nighters+
  • 3 starsLv. 50: ATK +588, Max HP +3,469, Healing +1,098Urban affinity S to SS
  • 4 starsLv. 60: ATK +686, Max HP +4,048, Healing +1,282MaxCostIncrease +5,000

Stars and Relationship Rank

Star bonuses

  • 4 starsBonus over 1 star: ATK +14%, Max HP +9%, Healing +12%Rank cap: 30
  • 5 starsBonus over 1 star: ATK +31%, Max HP +23%, Healing +27%Rank cap: 100

Koyuki (Pajamas) starts at 3 stars. Each star also lifts the Relationship Rank cap.

Relationship Rank bonus

  • 5Total bonus: ATK +12
  • 10Total bonus: ATK +32
  • 15Total bonus: ATK +57, Max HP +275
  • 20Total bonus: ATK +87, Max HP +605
  • 25Total bonus: ATK +97, Max HP +660
  • 30Total bonus: ATK +107, Max HP +715
  • 35Total bonus: ATK +117, Max HP +795
  • 40Total bonus: ATK +127, Max HP +875
  • 45Total bonus: ATK +147, Max HP +1,010
  • 50Total bonus: ATK +167, Max HP +1,145

Stats stop growing at rank 50.

Talents

  • Max HP25 levels, up to +5%
  • ATK25 levels, up to +5%
  • Healing25 levels, up to +5%

Gifts Koyuki (Pajamas) likes

6

Favourites

  • Lace Pillow
  • Cosplayer Coke-Bottle Glasses
  • Extravagant Gilded Jar of Greed
  • Jellies Cushion
  • Potted Bug-Eating Plant
  • Wavecat Pillow

A gift gives more Relationship Rank EXP the more of Koyuki (Pajamas)'s favourite-item tags it carries. Gifts not listed still give the base amount.

Lines and Memorial Lobby

When recruited: Act first, deal with consequences later!

MomoTalk status: I did it, but it's not my fault!

Koyuki (Pajamas)'s Recollection Lobby
Koyuki (Pajamas)'s Recollection Lobby

Upgrade costs

Open in the planner

EX Skill

  • Lv. 2Credit Points ×80,000Beginner Tactical Training Blu-ray (Millennium) ×12Ancient Battery Piece ×17
  • Lv. 3Credit Points ×500,000Normal Tactical Training Blu-ray (Millennium) ×12Beginner Tactical Training Blu-ray (Millennium) ×18Broken Ancient Battery ×13Mandrake Seed ×31
  • Lv. 4Credit Points ×3,000,000Advanced Tactical Training Blu-ray (Millennium) ×12Normal Tactical Training Blu-ray (Millennium) ×18Damaged Ancient Battery ×11Mandrake Sprout ×26
  • Lv. 5Credit Points ×10,000,000Superior Tactical Training Blu-ray (Millennium) ×8Advanced Tactical Training Blu-ray (Millennium) ×18Intact Ancient Battery ×7Mandrake Juice ×22

Basic, Enhanced and Sub Skills

  • Lv. 2Credit Points ×5,000Beginner Tech Notes (Millennium) ×5
  • Lv. 3Credit Points ×7,500Beginner Tech Notes (Millennium) ×8
  • Lv. 4Credit Points ×60,000Normal Tech Notes (Millennium) ×5Beginner Tech Notes (Millennium) ×12Ancient Battery Piece ×5
  • Lv. 5Credit Points ×90,000Normal Tech Notes (Millennium) ×8Broken Ancient Battery ×5Mandrake Seed ×12
  • Lv. 6Credit Points ×300,000Advanced Tech Notes (Millennium) ×5Normal Tech Notes (Millennium) ×12Broken Ancient Battery ×10Mandrake Seed ×19
  • Lv. 7Credit Points ×450,000Advanced Tech Notes (Millennium) ×8Damaged Ancient Battery ×3Mandrake Sprout ×17
  • Lv. 8Credit Points ×1,500,000Superior Tech Notes (Millennium) ×8Advanced Tech Notes (Millennium) ×12Intact Ancient Battery ×4Mandrake Juice ×8
  • Lv. 9Credit Points ×2,400,000Superior Tech Notes (Millennium) ×12Intact Ancient Battery ×9Mandrake Juice ×14
  • Lv. 10Credit Points ×4,000,000Secret Tech Notes ×1

Star promotion

  • 4 starsCredit Points ×200,000Koyuki (Pajamas)'s Eleph ×100
  • 5 starsCredit Points ×1,000,000Koyuki (Pajamas)'s Eleph ×120

Exclusive Weapon

  • 2 starsCredit Points ×1,000,000Koyuki (Pajamas)'s Eleph ×120
  • 3 starsCredit Points ×1,500,000Koyuki (Pajamas)'s Eleph ×180
  • 4 starsCredit Points ×2,000,000Koyuki (Pajamas)'s Eleph ×200

Talent: Max HP

  • Lv. 1-5Credit Points ×500,000Ancient Battery Piece ×50Physical Education Workbook ×10
  • Lv. 6-10Credit Points ×500,000Ancient Battery Piece ×75Physical Education Workbook ×10
  • Lv. 11-15Credit Points ×500,000Ancient Battery Piece ×100Physical Education Workbook ×10
  • Lv. 16-20Credit Points ×1,000,000Broken Ancient Battery ×30Physical Education Workbook ×20
  • Lv. 21-25Credit Points ×1,000,000Broken Ancient Battery ×40Physical Education Workbook ×20

Talent: ATK

  • Lv. 1-5Credit Points ×500,000Ancient Battery Piece ×50Shooting Workbook ×10
  • Lv. 6-10Credit Points ×500,000Ancient Battery Piece ×75Shooting Workbook ×10
  • Lv. 11-15Credit Points ×500,000Ancient Battery Piece ×100Shooting Workbook ×10
  • Lv. 16-20Credit Points ×1,000,000Broken Ancient Battery ×30Shooting Workbook ×20
  • Lv. 21-25Credit Points ×1,000,000Broken Ancient Battery ×40Shooting Workbook ×20

Talent: Healing

  • Lv. 1-5Credit Points ×500,000Ancient Battery Piece ×50Hygiene Workbook ×10
  • Lv. 6-10Credit Points ×500,000Ancient Battery Piece ×75Hygiene Workbook ×10
  • Lv. 11-15Credit Points ×500,000Ancient Battery Piece ×100Hygiene Workbook ×10
  • Lv. 16-20Credit Points ×1,000,000Broken Ancient Battery ×30Hygiene Workbook ×20
  • Lv. 21-25Credit Points ×1,000,000Broken Ancient Battery ×40Hygiene Workbook ×20

Art

Koyuki (Pajamas) key art

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