Nanami Tenjou

Gaku and Yukari's classmate who is constantly bullying Yukari. During her childhood, she became impaled on a broken climbing frame, forcing Yukari to repair using pieces of climbing frame while she was still conscious. This led her to become cold towards Yukari, feeling that accepting her ability is real would mean accepting what her body is made up of. She gradually opens up to Gaku, teaching her about various scientific theories.

(Source: Wikipedia)