Duo was forced to be left behind on a mission and a dragon brought him home. To save his life, Zeref sealed himself inside him, but it only started a paradox which no one could have expected.

I remember the colour of your eyes. Black. Like Onyx. No one else has those eyes. We are the same as before. No? Saving the world again. You are my light. Will be continued on my new account under the name Daygon Yuuki.