1girl, blue eyes, blue hair, boots, concert, crowd, detached sleeves, dress, frilled dress, frills, from behind, glowing, glowstick, hair ornament, headphones, holding, holding megaphone, long hair, looking at viewer, looking back, megaphone, one eye closed, open mouth, screen, sleeveless, sleeveless dress, smile, solo, stadium, thigh boots, twintails, very long hair