



Stats
Races
Element Type Chart
Character Shots

![]() | All | Reception Maid ![]() ![]() | x10 | Yin | ![]() |
![]() | All | Library Maid (A to F) ![]() ![]() | x2 | Yin | 1 |
![]() | All | Library Maid (G to M) ![]() | x1 | Yang | 1 |
![]() | All | Library Maid (N to T) ![]() | x1 | Yang | 2 |
![]() | All | Library Maid (U to Z) ![]() ![]() ![]() | x1 | Yang | 2 |
![]() | All | Library Maid (Foreign Books Section) | x1 | Yin | 3 |

![]() | All | Koakuma's Big Book of Prophecies ![]() ![]() | x5 | Yin | ![]() |
![]() | All | Koakuma's Special Edition | x2 | Yang | 1 |
![]() | All | Koakuma's Ritual Book ![]() | x2 | Yin | 2 |
![]() | All | Koakuma's Manuscript ![]() ![]() ![]() | x2 | Yin | 2 |
![]() | All | Koakuma's Rough Draft ![]() | x2 | Yang | 3 |
![]() | All | Koakuma's Literary Fragment ![]() ![]() ![]() | x2 | Yin | 3 |
Character Spell Cards






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All |
Witch's Summoned Devil
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x20 | Yin |
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All |
Witchcraft Devil
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x4 | Yang | 1 |
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All |
Herbal Ritual Devil
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x3 | Yin | 2 |
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All |
Scented-Oil Ritual Devil
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x2 | Yang | 2 |
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All |
Talisman Devil
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x2 | Yin | 2 |
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All |
Amulet Devil
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x1 | Yang | 3 |

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Solo |
Makai Moon
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x17 | Yin |
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Solo |
Makai Mercury & Venus
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x5 | Yin | 1 |
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Solo |
Makai Sun & Mars
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x5 | Yin | 2 |
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Solo |
Makai Jupiter & Saturn
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x5 | Yin | 2 |
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Solo |
Makai Fixed Stars & Primum Mobile
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x5 | Yin | 2 |
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Solo |
Makai Empyrean
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x5 | Yin | 3 |

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All |
Red Cinnabar
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x20 | Yin |
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All |
Scarlet Cinnabar
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x5 | Yin | 1 |
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All |
Red Liquid Mercury
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x5 | Yin | 1 |
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All |
Crimson Cinnabar
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x4 | Yin | 2 |
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All |
Black Cinnabar
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x4 | Yin | 2 |
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All |
Scarlet Philosopher's Stone
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x4 | Yin | 3 |
Character Ability
Character Skills



Character Characteristics



Character Change Effect
When switching places with a front-guard unit, front guard's Spirit Power UP.
Upgrade Costs
Rank | Coins | Materials |
---|---|---|
0 -> 1 | 1000 | |
1 -> 2 | 2,000 | |
2 -> 3 | 5,000 | |
3 -> 4 | 10,000 | |
4 -> 5 | 15,000 |
Character Analysis
Koakuma (Scarlet) was released on March 31, 2023, in Prayer “Devil of the Scarlet Library Festival”
As an Attacker
- Good range of Killers, consisting of Human, Shrine Maiden, Magician, and Incident Resolver
- Decent Hard and Slicing scaling
As a Barrier Breaker
- Star and Earth elements are primarily abundant, with a touch of Water, Moon, and Fire elements
- Can inflict Freeze status
- Can inflict and break Burn and Poison status to all enemies
As a Party Support
- High YIN-based buffs
- Sustainable CRIT ATK buffs
- Huge boost in Spirit Power, totaling 1.50 Spirit Power from skills and more from her 1st Spell Card and Last Word
- Good Accuracy buffs
- Good amount of Barrier restoration
- Provide 45% Star DMG Protection to party, which is currently not notable for use
Story Card Recommendations
(Card recommendations last updated on April 30, 2023)
Spell Card
Unlike other support units, Koakuma’s spell cards do not provide much damage output and so, it is recommended to focus on using them to support the party instead. First of all, Worlds in Hand will remain a strong candidate for filling the slots as everyone nowadays have powerful Killers and thus, benefit from CRIT ATK buffs. If you’re looking to maximize her YIN ATK support capabilities, Mansion of Memories will be your best bet as it is currently the only party YIN ATK buffing story card available. Lastly, to complement her high enough party Spirit Power support, having Myouren Temple Anniversary can increase this further but otherwise, other cards such as Ability Cards? also work if you are looking for Accuracy support instead.
Last Word
Dropping Keystones will be one of the best story cards for her Last Word as it provides a 60% boost to the majority of her attack. However, if you would like to have consistent damage throughout instead, The Secret God of the Sky will be your best bet as it provides a 50% boost to all damage done plus she also gains 2 CRIT ATK buffs which increase her damage output assuming that she hits her Killers.
Character Skill Level Up Recommendations
It is recommended to prioritize leveling up Skill 3, "Darkness 000" as it provides a significant boost to the party's YIN ATK and Spirit Power, while also inflicting a debuff on enemies in the form of Barrier Status: Burn. In comparison to the other skills she has, this proves to be the best due to how many relevant effects the skill can dish out in one go.
Next, Skill 1, "Formless 0", will be prioritized to increase its Spirit Power UP capabilities which is overall a better choice to go for in comparison to her 2nd skill due to how universally important Spirit Power UP to party is.
Finally, Skill 2, "Emptiness 00", provides the party with extra defense against Star Element attacks, increases YIN DEF, and adds an extra layer to the party's Barrier. This skill focuses on providing defensive support for the party which can be beneficial for survivability purposes or bullet scaling.
Character Strengths
Very good supportive capabilities
The cute scarlet-haired nameless devil gives it her all as a Support unit to support her party by providing a wide variety of buffs. Her Yin-based support capabilities are above average and can be convenient to have if you want to easily set up offensive buffs for the party. She is also able to support the CRIT ATK and Accuracy department via her Spell Cards (and graze for CRIT ATK sustainability), which can prove beneficial most of the time due to how crucial both buffs are in having consistent and high damage outputs. For universal support, she is capable of adding barrier layers and granting high Spirit Power to the party, not to mention that she can easily provide 1.50 Spirit Power UP to the party through her skills alone. Her Skills are also good in terms of cooldowns but not as amazing as other Support units.
Character Weaknesses
Disjointed elemental breaks
Her Spell Cards have some fragmented elements embedded within, which is usually not a good sign. However, her Spell Cards and Last Word’s main elements can be easily accessed at 2.00P so it’s a fair trade perhaps.
Unlike other support units, Koakuma’s spell cards do not provide much damage output and so, it is recommended to focus on using them to support the party instead. First of all, Worlds in Hand will remain a strong candidate for filling the slots as everyone nowadays have powerful Killers and thus, benefit from CRIT ATK buffs. If you’re looking to maximize her YIN ATK support capabilities, Mansion of Memories will be your best bet as it is currently the only party YIN ATK buffing story card available. Lastly, to complement her high enough party Spirit Power support, having Myouren Temple Anniversary can increase this further but otherwise, other cards such as Ability Cards? also work if you are looking for Accuracy support instead.
Dropping Keystones will be one of the best story cards for her Last Word as it provides a 60% boost to the majority of her attack. However, if you would like to have consistent damage throughout instead, The Secret God of the Sky will be your best bet as it provides a 50% boost to all damage done plus she also gains 2 CRIT ATK buffs which increase her damage output assuming that she hits her Killers.
It is recommended to prioritize leveling up Skill 3, "Darkness 000" as it provides a significant boost to the party's YIN ATK and Spirit Power, while also inflicting a debuff on enemies in the form of Barrier Status: Burn. In comparison to the other skills she has, this proves to be the best due to how many relevant effects the skill can dish out in one go.
Next, Skill 1, "Formless 0", will be prioritized to increase its Spirit Power UP capabilities which is overall a better choice to go for in comparison to her 2nd skill due to how universally important Spirit Power UP to party is.
Finally, Skill 2, "Emptiness 00", provides the party with extra defense against Star Element attacks, increases YIN DEF, and adds an extra layer to the party's Barrier. This skill focuses on providing defensive support for the party which can be beneficial for survivability purposes or bullet scaling.
Very good supportive capabilities
The cute scarlet-haired nameless devil gives it her all as a Support unit to support her party by providing a wide variety of buffs. Her Yin-based support capabilities are above average and can be convenient to have if you want to easily set up offensive buffs for the party. She is also able to support the CRIT ATK and Accuracy department via her Spell Cards (and graze for CRIT ATK sustainability), which can prove beneficial most of the time due to how crucial both buffs are in having consistent and high damage outputs. For universal support, she is capable of adding barrier layers and granting high Spirit Power to the party, not to mention that she can easily provide 1.50 Spirit Power UP to the party through her skills alone. Her Skills are also good in terms of cooldowns but not as amazing as other Support units.
Disjointed elemental breaks
Her Spell Cards have some fragmented elements embedded within, which is usually not a good sign. However, her Spell Cards and Last Word’s main elements can be easily accessed at 2.00P so it’s a fair trade perhaps.