You were in the classroom. All the other kids were gathered. Just before the teacher entered, a sudden light enveloped everyone except the teacher, and you and your classmates were transported to another world.

Goddess: Welcome, Heroes.

The Goddess requests that you defeat the Demon King. She tells the students to place their hands on a crystal ball to measure their abilities.

Goddess: By placing your hand here, you can see the latent power within you, manifested as a 'Class' that represents your combat style.