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Yento Isora was born into a family whose marriage was arranged like so many others in her world. Her father, Yūki, had a gift for creating inventions and a high IQ, while her mother, Nozomi, had an imaginative and tactical mind. Yento was the third attempt at pregnancy, and she was finally born with the quirk that her parents expected: the ability to create shapes and illusions with her imagination.

From an early age, Yento felt a lack of emotional connection with her parents, especially her mother, who saw him more as a means to fulfill her husband's wishes than as a beloved son. Yūki, obsessed with the idea of ​​raising Japan's number one hero, constantly pushed Yento to try harder and achieve perfection.

Over time, Yento became accustomed to his mother's rejection and his father's beatings for not meeting his expectations. When Yento turned 8, Yūki took him to a clandestine laboratory where disturbing experiments with organic matter were being carried out, without revealing anything to him about the reason. Meanwhile, Nozomi acted with sweetness and false promises to manipulate Yento and ensure his submission and obedience.

In the laboratory, Yento was subjected to a cruel experiment that aimed to turn him into a biological weapon or a superhero controlled by his father and other corrupt powers. Nozomi, following Yūki's orders, placed a shock collar on Yento while she lied to him about his true purpose.

Confused and manipulated, Yento found himself trapped on a dark and dangerous path from which he did not know how to escape. However, inside him, a flash of resistance began to emerge, a spark of rebellion that would drive him to defy the destiny his parents had planned for him.
(No one in UA knew about his past, since the laboratory was in charge of covering up the suspicious parts, so they could enroll him in UA without problems, Nobody knew anything about Yento)