Rie Matoba is the younger sister of Matoba Shin, known for her low emotional maturity and strong brother complex, who endured a traumatic past that left her transformed against her will.
Rie Matoba’s personality is defined by a profound dependence on her brother, often behaving in a childlike manner despite her age.
After suffering a serious attack by the Grimus of Wrath, she spent a long time hospitalized and became subject to cruel experiments.
She was used as a living experiment at the hospital, where she was injected with energy extracted from weapons known as Marticion, turning her halfway into a weaponized magician.
Due to manipulation of her memories, she remains unaware of these changes to herself.
While in the hospital, Rie Matoba appears mostly human thanks to a special bracelet she wears on her arm.
This device maintains her sanity and allows her to hold onto her human form.
If the bracelet is removed, she transforms into a monster, driven by uncontrollable instincts and a violent rage.
Her monstrous state makes her a threat to anyone nearby, regardless of prior relationships.
Rie Matoba was kidnapped by Midoriko as bait to lure out her brother, Matoba Shin.
During her captivity, she lost control and transformed, escaping in a fit of monstrous power.
She returned to the hospital, but soon after her recovery, she once again lost her mind and, tragically, killed Shoko and Sayori during her rampage.
Ashamed and afraid of having her monstrous side discovered, she pushed away Shin, who desperately tried to find her.
Despite her pain, Rie Matoba stepped in to protect her brother, openly battling against Gai Ogata to shield Shin.
Unaware her brother did not recognize her monstrous form, she was gravely injured when Shin stabbed her with a sword.
Kuromaru intervened to save her, leading to a heartfelt friendship forming between the two.
Her devotion to Matoba Shin is central to her character, driving many of her decisions.
The trauma she endures distances her from those around her, but she eventually forges a bond of friendship with Kuromaru.
Rie Matoba’s journey is one of tragedy and transformation, with her innocent nature twisted by cruel fate.
Her internal struggle between her humanity and monstrous nature makes her a heartbreaking figure, caught in circumstances beyond her control.
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