Sasaki, Atsuko
Summary
Atsuko Sasaki, widely recognized by the nickname A-chan, served as Katarina's closest companion during her previous life. During her elementary school years, she faced constant bullying, including having her belongings hidden and being deliberately ignored by her peers. This persistent exclusion and social isolation drove her to withdraw into a recluse lifestyle, leaving her with a deep-seated fear of interacting with others.
