I'm Kongou

A series of anime-style images shows a girl with long brown hair and a headband, first with a surprised expression, then a close-up of her face with a wide, open-mouthed smile, followed by a shot of her torso in a white off-the-shoulder top with a lace-up front, and finally a full shot of her smiling face. The sequence ends with a group of chibi-style versions of the same character, all with wide eyes and open mouths, appearing excited or shouting.