Hiyoko Strike!: Houmatsu no Yume

During a dull class, Shin gazes out the window when a girl named Utakata suddenly enters through it. She behaves strangely, removing her clothes on a desk, touching Shin inappropriately, and displaying features resembling animal ears and a tail. Shin finds the bizarre events overwhelming yet oddly stimulating, as his ordinary world becomes unexpectedly more vibrant.