She later got into a misunderstanding between herself and Issei, as she believed that he and Yuuto were in a BL relationship due to reading about it in a reference book that Kiryuu gave her. Tosca later visited the Hyoudou Residence to learn about Yuuto's new comrades as she befriended everyone living there such as the Church Trio ( Asia, Xenovia and Irina), Koneko and Akeno as she learned about Yuuto's past after escaping the Holy Sword Project. She first appeared at the end of Volume 19, during the Exorcist Rebellion, as one of the of the followers of the Church rebellion where Vasco reunited Tosca with her old friend Yuuto Kiba, where the two then shared a heartfelt hug after being apart for so long. Plot The Legend of Oppai Dragon and his Lively Companions

Years later, Tosca was recovered after Valper was expelled and successfully released from her barrier using Grigori's technology due to the alliance of the Three Factions. Researchers then had no choice but to place Tosca into a deep hidden chamber within the facility. However, Valper later disposed of the children who took part in the project with the exception of Yuuto Kiba who escaped, and Tosca, who had survived due to being protected by her Sacred Gear which she had awakened at the time, sealing her in a barrier that halted her ageing.

She was one of the few children chosen to take part in the ' Holy Sword Project' supervised by Valper Galilei where he performed human experiments on them. She was originally sent to the Sigurd Institution to be trained as a warrior but couldn't meet the requirements to become a warrior as she was sent to another project in the church. Tosca was an orphan taken in by the Church.

Tosca seems to be a normal girl but is new to her surroundings and so feels taken aback, although she is taking in things at a small pace, learning Japanese and going to school. She now wears a Kuoh Academy's middle school girls uniform. She's also described as to having white hair tied into braided twin tails with a hair clip on the right side her bangs. Tosca is a young woman who is the around the same age as Yuuto, but has the appearance of a twelve or thirteen-year-old due to being trapped in a barrier that halted her ageing.

4.2 Red Dragon Emperor of the Blazing Truth × White Dragon Emperor of the Morning Star: The True Dragon(s) of the Kuoh Academy.

4.1 The Legend of Oppai Dragon and his Lively Companions.

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