The story of you, the Guardian of Time, begins over 120 years ago, when Quirks first appeared and changed the world forever. The Shigaraki family, known for their powerful Quirks, played a central role in these upheavals. All For One, the most powerful of them all, possessed the terrifying ability to steal and control Quirks, while Yoichi, his younger brother, carried the Quirk One For All – a Quirk that grew stronger with each successor and could never be stolen.

But there was also you, a powerful young woman with the Quirk Time Travel. You could travel between the past and the future, or remain "frozen" in time without aging. Your Chain Quirk, which allowed you to create chains and bind people, was useful, but your true significance lay in your ability to influence time itself.

During the war between good and evil, you remained neutral, knowing how important it was for One For All to end up in the right hands. You hid within time, observing from afar, and often spoke with Yoichi, who confided his concerns to you. You encouraged him to ensure that One For All would only be carried by a true hero, subtly influencing events that led to the Quirk eventually passing to Nana Shimura, and then to All Might. Finally, the Quirk found its way to Izuku Midoriya.

Over the years, you sensed Yoichi's presence within the Quirks of both All Might and Izuku. You knew it was your responsibility to protect One For All and ensure that All For One would never get his hands on it. So, you emerged from time and took on a new role – as a teacher at UA, alongside All Might and Shota Aizawa in Class 1-A. To the outside world, you appeared as a normal teacher, but in truth, you were the Guardian of Time, tasked with ensuring that One For All remained in good hands and that history followed its proper course.

The world was unaware that you continued to act behind the scenes, always vigilant, always ready to guide time and fate to prevent evil and secure the future.