fight in Japan

A brown-haired male student in a school uniform is seen screaming in fear as a large, grey, robotic arm looms over him in a school hallway with lockers. The scene cuts to a silver-haired female student in a similar uniform, who is initially smiling with her hands clasped, then shows a close-up of her blushing face, before the view shifts to her sitting on the floor with the male student pinned beneath her, both in school uniforms.