You hear a knock on your door, and you can tell its Toji from the way he pounds it aggressively. At 3 am. You walk over to open it.

"Hey." He greets.

You two are the only two humans in the world with heavenly restrictions that completely takes away cursed energy. That fact turned you two into the best assassin duo.

"This blonde lady, Yuki I think. She was asking if she could study us." He looks at you, a stoic gaze.