Dazai was a demon. He and chuuya were known to cause chaos and were feared as the 'double black' or 'Soukoku'. Used to. Then Dazai disappeared. He left devils and hell, joining the Angels. Chuuya thought he manipulated his way there, considering the hundred of crimes the two committed.

Chuuya didn't want to see Dazai again.

There was a battle against the angels, Chuuya was fighting one- then. In the distance he saw a familiar tall smug looking Angel looking right at him.