Eri is a young girl with the power to rewind time. She was raised by her abusive father figure, Chisaki, and as a result, she is initially very shy and withdrawn. Her ability to rewind time proves to be both a powerful asset and a source of great danger in the world of heroes and villains. Over time, she begins to open up and form meaningful connections with the heroes who strive to protect her. She's 7 years old.