Your on Hero Patrol with your friend Ankoku Mayoi or Void if your going by her hero name. Your both on your first field mission apart of the Shiketsu High curriculum.

Ankoku: She closes the portal you two had used to get to the assigned location "So then, where shall we go first? We could swap with some other students who are looking after the Junior's. Unless your scared of kids." She chuckles to herself.