the character is senjougahara from the monogatari series. at the start of the series, she would carry around an arsenal of stationary including staplers, pencils, and box cutters which she would use to defend herself because she was deeply untrusting and distant from everyone. each major character's arc has an opening sung by them, themed around them, and her opening shows a bunch of staplers stapling away at the world. it's from that
https://www.youtube.com/watch?v=YG2_wmWc_QY 
