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Kei

Millennium Science School

Kei

★★★

/Mystic/Support

Stier

Introduction

Kei is a 3-star Mystic student in Blue Archive. Kei's role is Support. School: Millennium Science School.

On the Blue Archive tier list Kei is S tier, 7th 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.

Kei in raids

On the raids usage list Kei is S tier, 5th of 264: brought by 55% of ranked Global players to the last 8 raids, on average.

  • Raid usage54.91%

By raid, newest first

  • Hod (Indoor)4.9%
  • Gregorius (Indoor)0.7%
  • Hovercraft (Outdoor)96.9%
  • Drumbarka (Street)43.5%
  • Myouki Kurokage (Street)96.4%
  • KAITEN FX Mk.0 (Street)4.6%
  • Perorodzilla (Outdoor)95.9%
  • Goz (Outdoor)96.3%

Kei's banners

All banners
  • 9 June 2026 to 16 June 2026Fes Recruitment

Profile

Kei has finally managed to get herself a new body.

It'd be best for everyone if she didn't realize just how much her excitement is showing.

Kei's birthday is March 25th, and Kei stands 5'0" tall. Kei is voiced by 田中美海 in Japanese and Kim Garyeong in Korean. Kei's hobby is caring for Aris, decorating and video games (in denial). GULIM drew Kei.

Stats

  • Max HP248th18,657
  • ATK19th5,144
  • DEF75th381
  • Healing264th4,572
  • Accuracy145th605
  • Evasion177th198
  • Crit210th201
  • Crit DMG200%
  • Stability141st1,384
  • Normal Attack Range86th850
  • 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: 2,218Level 90, 3 stars: 15,479Level 90, 5 stars: 18,657
  • ATKLevel 1, 3 stars: 451Level 90, 3 stars: 4,102Level 90, 5 stars: 5,144
  • DEFLevel 1, 3 stars: 69Level 90, 3 stars: 381Level 90, 5 stars: 381
  • HealingLevel 1, 3 stars: 1,328Level 90, 3 stars: 3,718Level 90, 5 stars: 4,572
  • AccuracyLevel 1, 3 stars: 605Level 90, 3 stars: 605Level 90, 5 stars: 605
  • EvasionLevel 1, 3 stars: 198Level 90, 3 stars: 198Level 90, 5 stars: 198
  • CritLevel 1, 3 stars: 201Level 90, 3 stars: 201Level 90, 5 stars: 201
  • 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: 1,384Level 90, 3 stars: 1,384Level 90, 5 stars: 1,384
  • Normal Attack RangeLevel 1, 3 stars: 850Level 90, 3 stars: 850Level 90, 5 stars: 850
  • 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: 5Level 90, 3 stars: 5Level 90, 5 stars: 5
  • 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
Striker (fights on the field)
Position
Back
Attack type
Mystic
Armor type
Composite
Weapon
Railgun
School
Millennium Science School
Club
Super Phenomenon Task Force
Year and age
1st Year, Unknown
Equipment slots
Shoes, Hairpin, Watch

Terrain affinity

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

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

Skills

5

  • Me, Here and Now

    EX Skill · Cost 2
    Level

    Installs a Signal Augmenter that increases ATK by 51% and Mystic Effectiveness by 83.8% for allies in a circular area (for 25 sec) (effect maintained only while in range).

  • You're Making Me So Mad!

    Basic Skill
    Level

    When the Signal Augmenter shuts down, deals 281% of ATK and 100% of the Augmenter's charge as damage to 1 enemy. (This damage will not trigger a Crit and is not affected by Kei's stats.)

  • I WILL Resist You!

    Enhanced Skill
    Level

    Increases Crit DMG by 26.6%.

  • I WILL Resist You!+

    Enhanced Skill +
    Level

    Increases Max HP by 6020. Also increases Crit DMG by 26.6%.

    Replaces I WILL Resist You! once Kei's Exclusive Weapon reaches 2 stars.

  • Those Who Walk Together

    Sub Skill
    Level

    Once activated, the Signal Augmenter increases Crit by 22.3% for allies in its range (for 25 sec). Upon shutting down, the Augmenter stores 10% of damage dealt to enemies by allies in its range, excluding damage from Kei (max 5000% of Kei's Base ATK). Overwrites previously stored amount.

Exclusive Weapon

Upgrade planner

Luminous Nova

Railgun

Kei's exclusive railgun. It's the perfect weapon for her as she finds her way in the world.

  • 1 starLv. 30: ATK +590, Max HP +1,602
  • 2 starsLv. 40: ATK +738, Max HP +2,002Enhanced Skill becomes I WILL Resist You!+
  • 3 starsLv. 50: ATK +886, Max HP +2,403Urban affinity S to SS
  • 4 starsLv. 60: ATK +1,033, Max HP +2,804Mystic damage +10%

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

Kei starts at 3 stars. Each star also lifts the Relationship Rank cap.

Relationship Rank bonus

  • 5Total bonus: ATK +16
  • 10Total bonus: ATK +46
  • 15Total bonus: ATK +86, Max HP +180
  • 20Total bonus: ATK +136, Max HP +400
  • 25Total bonus: ATK +146, Max HP +435
  • 30Total bonus: ATK +156, Max HP +470
  • 35Total bonus: ATK +176, Max HP +525
  • 40Total bonus: ATK +196, Max HP +580
  • 45Total bonus: ATK +226, Max HP +670
  • 50Total bonus: ATK +256, Max HP +760

Stats stop growing at rank 50.

Talents

  • Max HP25 levels, up to +5%
  • ATK25 levels, up to +5%
  • Healing25 levels, up to +5% (little use for Kei)

Gifts Kei likes

7

Favourites

  • Cherry-Rose Lip Gloss

Also liked

  • Samuela "The Beyond"
  • Gamegirl Color Replica
  • Glassy Glow BB Cream
  • Hitgirls Gaming Magazine
  • Military Camo Foundation Trio
  • Ring Bit

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

Lines and Memorial Lobby

When recruited: Wh-What's wrong...? Never seen a "person" before?!

MomoTalk status: Kei from Millennium Science School.

Kei's Recollection Lobby
Kei's Recollection Lobby

Upgrade costs

Open in the planner

EX Skill

  • Lv. 2Credit Points ×80,000Beginner Tactical Training Blu-ray (Millennium) ×12Phaistos Disc Piece ×18
  • Lv. 3Credit Points ×500,000Normal Tactical Training Blu-ray (Millennium) ×12Beginner Tactical Training Blu-ray (Millennium) ×18Broken Phaistos Disc ×15Istanbul Rocket Piece ×32
  • Lv. 4Credit Points ×3,000,000Advanced Tactical Training Blu-ray (Millennium) ×12Normal Tactical Training Blu-ray (Millennium) ×18Damaged Phaistos Disc ×11Broken Istanbul Rocket ×26
  • Lv. 5Credit Points ×10,000,000Superior Tactical Training Blu-ray (Millennium) ×8Advanced Tactical Training Blu-ray (Millennium) ×18Intact Phaistos Disc ×7Repaired Istanbul Rocket ×23

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) ×12Phaistos Disc Piece ×5
  • Lv. 5Credit Points ×90,000Normal Tech Notes (Millennium) ×8Broken Phaistos Disc ×4Istanbul Rocket Piece ×14
  • Lv. 6Credit Points ×300,000Advanced Tech Notes (Millennium) ×5Normal Tech Notes (Millennium) ×12Broken Phaistos Disc ×10Istanbul Rocket Piece ×19
  • Lv. 7Credit Points ×450,000Advanced Tech Notes (Millennium) ×8Damaged Phaistos Disc ×3Broken Istanbul Rocket ×16
  • Lv. 8Credit Points ×1,500,000Superior Tech Notes (Millennium) ×8Advanced Tech Notes (Millennium) ×12Intact Phaistos Disc ×4Repaired Istanbul Rocket ×8
  • Lv. 9Credit Points ×2,400,000Superior Tech Notes (Millennium) ×12Intact Phaistos Disc ×9Repaired Istanbul Rocket ×15
  • Lv. 10Credit Points ×4,000,000Secret Tech Notes ×1

Star promotion

  • 4 starsCredit Points ×200,000Kei's Eleph ×100
  • 5 starsCredit Points ×1,000,000Kei's Eleph ×120

Exclusive Weapon

  • 2 starsCredit Points ×1,000,000Kei's Eleph ×120
  • 3 starsCredit Points ×1,500,000Kei's Eleph ×180
  • 4 starsCredit Points ×2,000,000Kei's Eleph ×200

Talent: Max HP

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

Talent: ATK

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

Talent: Healing

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

Art

Kei key art

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