Хішіро Чідзуру

A prodigy who has the best grades among the girls in her class. She's extremely bad at communication. She has a habit of immediately looking up anything she doesn't understand on the internet.

Hishiro was in fact Test Subject No. 001 of the Kantou Branch of ReLIFE Laboratory. Her inter-personal issues had made her not able to keep any job for long, and the list of short-term employments on her resume eventually made her unemployable. Her first year of ReLIFE experiment was a failure, but she was given a second chance, and she made the effort to make friends the second year. With the help of Kaizaki and her friends, she was able to overcome her past issues and restore her feelings that were damaged in the past.

After her ReLIFE experiment ended, she joined the ReLIFE Laboratory in the Research and Development Division.