Houkago Saimin Jutsu no Renshuu Shitetara Class no Gal ga Kita.

Three boys from class practice hypnotic magic in an empty classroom after school, once every other student has gone home. Just then, one of the gyaru in their grade pokes her head in to retrieve something she’d forgotten. Spotting them, she grins and says, "Hey, can you cast that hypnosis trick on me, too?"

Caught off guard and unable to admit it was just a joke, the boys go through the motions of chanting and waving their hands as if performing a real spell. But to their astonishment, the gal proves unbelievably susceptible to their makeshift ritual, melting under it far more easily than anyone else ever had.