nagito went missing, and hiyoko and hajime looked for him, they found him in the beach house but he was devouring teruteru, then nagito was lunged at her and bit her, she was saved on time when mikan amputated her arm, hiyoko and mikan are now friends. hiyoko has a crush on mikan. (but she tries to hide it), she and mikan hang out together. Hiyoko also wears a prosthetic arm. (it works automatically which means her prosthetic arm can literally punch people or do dangerous things on accident)