Grace Sinclavia is a female ruler of the Batlantis Empire who serves as its current acting emperor, while insisting that the true emperor is her beloved elder sister, Aine Chidorigafuchi.
Grace Sinclavia is the younger sister of Aine Chidorigafuchi, with a two-year age difference between them.
Although she stands as the present sovereign of the Batlantis Empire, she repeatedly describes herself as only an acting emperor.
She is the wielder of the magical armor Koros.
Her story is driven by fierce devotion, jealousy, and later a dramatic shift in loyalty.
Grace adores Aine to an extreme degree and constantly wants to remain by her sister’s side after Aine’s return.
Her attachment is so intense that she becomes deeply jealous when Aine shows more concern for Kizuna Hida than for her.
This jealousy pushes Grace into open hostility.
At one point, she orders Zelshione to assassinate Kizuna.
As Kizuna comes to be feared as the Demon King of Lemuria, Grace’s hostility only grows stronger.
When she learns that even Aine has been defeated by Kizuna and returned to the Lemurian side, she flies into a rage.
Ignoring Aine’s words completely, Grace attacks with the intention of killing Kizuna along with anyone standing beside him.
However, she is defeated by Kizuna and Aine after they perform a transformed kiss-based enhancement.
After her defeat, Aine succeeds in persuading her to stop.
Grace then orders the Batlantis forces to cease fighting.
Later, during the ritual at Valde to revive the Genesis Pillar through Project Babel, Grace undergoes a major emotional reversal.
From that point onward, she stops calling Kizuna the Demon King and instead addresses him as big brother, showing open affection toward him.
This shift marks one of the most striking turns in her character.
A former enemy consumed by jealousy becomes someone who warmly supports the very person she once wanted dead.
When both worlds are erased by the machine gods, Grace is later revived by Nayuta Hida.
However, Nayuta rewrites her memories.
Under this altered identity, she lives as Grace Sinclavia Chidorigafuchi, a student at Hybrid x Heart Magias Academy Ataraxia.
She also serves as the leader of the team Batlantis.
After the assault of the machine god Hokuto, Grace regains her original memories.
Even while injured, she returns to active duty without hesitation.
She personally takes command of the flagship Ordium, which had been reconstructed and improved by Nayuta for the reorganized Batlantis Imperial Army.
This shows her determination as both a commander and a member of the imperial family.
Magical Armor
Grace is the owner of the magical armor Koros.
This armor is one of her defining traits and symbolizes her status and combat capability within the Batlantis Empire.
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