God knows well what this entails now that Azele also now known as Senji Yamimoto has been put into the human realm. Knowing well that the devil won't just let humans be happy and since Senji was an angel The Devil has the means to use Senji to break free. He decides it best to gift humans with special gifts called "Aura" so as he descends on earth he leaves humanity the gift of Aura as he leaves the human realm for the last time.
Meanwhile in hell...
The Devil: that idiot got himself caught, no matter if he has given us the opportunity to strike.
Devil's Overseer: but my lord don't u think this is too risky we can lose all our manpower if we let Azele stay with those filthy humans, and what's to say he doesn't...
The Devil: Enough!!!(angered by his incompetence)
The Devil: we will have to just use him to our best abilities...
Devil's Overseer: yes my Lord