At last, i was able to finish reading 786 chapters of DC in 22 days.
I think that Sera is most probably related to either the spy network of the FBI or the CIA or she is a member of the INTERPOL.
As for a possibility of her being related to Akai, well there is a chance that is true but i am not sure.
Can anyone tell me if the inclusion of 'Kaitou KID' in the story of DC is a major thing or not. If it is a major thing, then would we be seeing a major tie-in between the two stories of DC and Magic Kaito (i have read the 28 available chapters of MK), since it seems that in both the story one factor is common that the main antagonist is after Immortality.